Resources for X Ray Emission

X Ray Emission News and Recent Updates

Students, professor make presentations at AAS conference

Dr. Pannuti was the lead author on a second poster presentation, titled “On the Hard X-ray Emission Detected from the Northwestern Rim of the Galactic Supernova Remnant G156.2+5.7.” Moffitt and Lackey-Stewart served as co-authors on the presentation ...

NASA scientists build first-ever wide-field X-ray imager

STORM and another NASA-funded experiment, the Diffuse X-ray emission from the Local galaxy (DXL), flew aboard a two-stage Black Brant IX sounding rocket from the White Sands Missile Range, Las Cruces, N.M., in December 2012. DXL, developed by University of ...

NASA Builds First-Ever Wide-Field X-Ray Imager

See the photos here. The unique collaboration involved heliophysics, astrophysics and planetary science divisions at NASA's Goddard Space Flight Center ... X-ray emissions in the atmospheres of Venus and Mars, leading some to question whether the charge ...

Video: Why is X-ray light emanating from black holes?

It is a mystery that has stymied astrophysicists for decades: how do black holes produce so many high-power X-rays? In a new study, astrophysicists from The Johns Hopkins University, NASA and the Rochester Institute of Technology conducted ...

Mystery behind X-Ray light from blackholes solved

Supported by 40 years of theoretical progress, the team showed for the first time that high-energy light emission is not only possible ... which is responsible for much of the ultra-violet and X-ray luminosity seen in the solar spectrum, researchers ...

Baffling pulsar leaves astronomers in the dark

whose radio emission is known to switch on and off periodically, exhibits the same behavior, but in reverse, when observed at X-ray wavelengths. It is the first time that a switching X-ray emission has been detected from a pulsar, and the properties of ...

NGC 602: Taken under the 'wing' of the small magellanic cloud

New Chandra observations have been used to make the first detection of X-ray emission from young stars with masses similar to our Sun outside our Milky Way galaxy. The Chandra observations of these low-mass stars were made of the region known as the "Wing ...

Mystery of X-Ray Light from Black Holes Solved

In a new study, astrophysicists from The Johns Hopkins University, NASA and the Rochester Institute of Technology conducted research that bridges the gap between theory and observation by demonstrating that gas spiraling toward a black hole inevitably ...

NASA: Supermassive black hole 'napping' and may be dormant

Both Chandra and NuStar were trained on NGC 253 in late 2012 and researchers found that the X-ray emission seems to have stopped. "Our results imply that the black hole went dormant in the past 10 years," said Bret Lehmer of the Johns Hopkins ...

X-rays spotted bouncing off relativistic matter spiraling into black hole

The detailed information the astronomers gleaned allowed them to rule out some explanations for the bright X-ray emission, bringing us closer to an understanding of the extreme environment near these gravitational engines. Despite the stereotype of black ...

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Video: Why is X-ray light emanating from black holes?

It is a mystery that has stymied astrophysicists for decades: how do black holes produce so many high-power X-rays? read more more

Johns Hopkins Researcher, Colleagues, Solve Mystery of X-ray Light Coming From Black Holes

It is a mystery that has stymied astrophysicists for decades: how do black holes produce so many high-power X-rays? more

Mystery of X-ray light from black holes solved

Astrophysicists using high-powered computer simulartions demonstrate that gas spiraling toward a black hole inevitably results in X-ray emissions. more

Mystery behind X-Ray light from blackholes solved

NASA Scientists claim to have solved the mystery how blackholes produce so many high-power X-rays. Photo Courtesy: NASA more

Researchers solve mystery of X-ray light from black holes

( Johns Hopkins University ) Astrophysicists using high-powered computer simulartions demonstrate that gas spiraling toward a black hole inevitably results in X-ray emissions. more

NASA Chandra, Spitzer Study Suggests Black Holes Abundant Among The Earliest Stars

By comparing infrared and X-ray background signals across the same stretch of sky, an international team of astronomers has discovered evidence of a significant number of black holes that accompanied the first stars in the universe. more

Black holes abundant among the earliest stars

By comparing infrared and X-ray background signals across the same stretch of sky, astronomers have discovered evidence of a significant number of black holes that accompanied the first stars in the universe. more

NASA study suggests abundance of black holes

Washington, June 6 : By comparing infrared and X-ray background signals across the same stretch of sky, an international team of astronomers has discovered evidence of a significant number of black holes that accompanied the first stars in the universe. more

Downloadable Document from Eriez Provides Answers to Frequently Asked Questions about X-Ray ...

Erie, PA - Eriez is offering a free downloadable PDF that offers answers to the most frequently asked questions about cabinet x-ray systems. “There are a lot of misconceptions about x-ray technology,” explains Ray Spurgeon - Eriez X-Ray Product Manager. “We produced this FAQ document to help educate others on the x-ray technology and its capabilities.” Safety precautions ... more

Andromeda: My God, It's Full of Black Holes

The central region of the Andromeda galaxy is chock-full of black holes, according to extensive observations with NASA's Chandra X-ray Observatory. Continue reading → more

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X Ray Emission Answers

Resolved Question: Astronomy questions?!!?

5) the measure of a stars brightness is called its? A) magnitude B) parallax C) intensity D) color index 6) a hertzsprung-russell(H-R) diagram shows the relationship between? A) absolute magnitude and apparent magnitude B) temperature and absolute magnitude C) parallax and temperature D) apparent magnitude and parallax 13) the sun is A) a black hole B) black dwarf C) main-sequence star D) red giant 14) what is the next stage in the suns life cycle? A) white dwarf B) red giant C) planetary nebula D) black dwarf 15) light cannot escape in the intense gravitational pull of a? A) black hole B) black dwarf C) main-sequence star D) red giant 17) which object is largest? A) global cluster B) galaxy C) star D) planet 9) in the milky way the most abundant gas in emission nebulae is A) helium B) hydrogen C) argon D) nitrogen 10) massive stars terminate in a brilliant explosion called a? A) red giant B) protostar C) neutron star D) supernova 11) before being engulfed matter that is pulled into a black hole should become very hot and emit? A) infrared radiation B) hydrogen nuclei C) atoms D) X-rays 12) when a main-sequence star is exhausted the fuel in its core it becomes a? A) black hole B) black dwarf C) neutron star D) red giant more

Resolved Question: Use the Bohr model to estimate the Kα X-ray wavelength.?

In each atom of a metal target in an X-ray tube, there are Z protons. This metal emits a Kα X-ray that has a wavelength of 1.45x10^-10m. Use the Bohr model to estimate the Kα X-ray wavelength emitted by a target each atom of which contains Z-1 protons. more

Resolved Question: Quantum/Line Spectra (A Level)?

Hi! My teacher told me that when we talk about the emission of photons when electrons get back to ground state after excitation in a hydrogen atom, we refer exclusively to outermost electrons. However, I got confused when studying about X-ray spectra. Another teacher's notes stated that the sharp peaks observed in a X-ray spectrum arise due to inner electrons in the metal target getting excited and returning to ground state. My questions are, can inner electrons be excited, or not? What does intensity of emitted have to do with wavelength? Please. more

Resolved Question: what are the different types of radiation that can be emitted from an atom?

I already know about alpha, beta and gamma but I want to know more give me as long a list as possible please more

Voting Question: How electromagnetic emissions of nuclear reactions are useful in cancer treatment, or an x ray image?

If you could help me find some information or websites on this subject it would help a lot! Thanks! more

Resolved Question: What types of radiation (electromagnetic or high-energy particle)?

are produced in the radioactive decay of lutetium-177 more

Voting Question: HELP IN CHEMISTRY. WE DONT HAVE A BOOK?

I NEED HELP AND I CANT FIND THESE IN MY BOOK OR ON A WEBSITE 1. Describe radiation. 2. Explain why radiation is emitted. 3. Define a nuclear reaction. 4. What is the difference between a nuclear reaction and a typical chemical reaction? 5. Identify 3 types of radiation. 6. How is nuclear stability determined? The purpose of radioactive decay is to _______________________________________. 1. Compare and contrast an isotope to a radioisotope. 2. Describe alpha particles. Include some properties associated with behavior. 3. Describe the change that happens to an atom that emits an alpha particle. 4. Describe beta particles. What happens at the nuclear level when a beta particle is emitted? 5. How does the loss of a beta particle affect the mass of an atom? 6. What happens to the atomic number of an atom when it loses a beta particle? How does this affect the identity of the atom? 7. Describe gamma rays. How do gamma ray emissions affect the mass of atoms? 8. How are X-rays emitted? 9. Describe the relative penetrating powers of 3 different radiation types, and why. more

Resolved Question: Can you help me and check my answers here?

Protons and neutrons are made from which of the following particles? (Points : 3) up quarks only down quarks only up quarks and down quarks hadrons <--------- 2. Which of the following does half-life measure? (Points : 3) alpha emission beta emission radioactive decay rate <--------- gamma emission 3. Which of the following radioisotopes is naturally occurring? (Points : 3) 238/94 Pu 3/1 H <--------- 258/103 Lr 242/96 Cm 4. When the amount of a radioactive substance is reduced by 50%, what has occurred? (Points : 3) alpha radiation a half-life <------------ beta radiation gamma radiation 5. Which of the following distinguishes a nuclear reaction from a chemical reaction? (Points : 3) It involves atoms. There is an exchange of electrons. There is a change in the nucleus. <--------- Mass is conserved. 6. Which of the following will stop beta particles? (Points : 3) paper aluminum foil <---------- air skin 7. Which of the following symbols represents half-life? (Points : 3) alpha beta Ea t1/2 <---------- 8. For the given transmutation, X is which of the following? 242/96 Cm + x ---> 245/98 Cf + 1/0n (Points : 3) 0/-1 e 0/+1 e 4/2 He <-------- gamma 9. Which of the following requires a critical mass? (Points : 3) fission <-------- leptons beta emission gamma emission 10. Which of the following is a nucleon? (Points : 3) electron up quark <-------- down quark neutron 11. Which of the following reactions describes a beta emission? (Points : 3) 59/26 Fe ---> 59/27 Co + 0/-1e 239/94 Pu + 4/2 He ---> 242/96 Cm + 1/0n <------ 118/54 Xe ---> 118 I + 0/+1e 226/88 Ra ---> 222/86 Rn + 4/2 He 12. If 0.78% of a radioactive substance remains, then how many half-lives have passed? (Points : 3) 3 4 6 7 <------- 13. What is the upper limit of Z for an element to be a naturally occurring radioisotope? (Points : 3) 88 92 <------- 102 68 14. Which of the following reactions would you find in a radioisotope thermal generator? (Points : 3) 1/1 H + 2/1 H ---> 3/2 He 2/1 H + 2/1 H ---> 3/2 He + 1/0n 238/94 Pu ----> 234/92 U + 4/2 He^2+ 235/92 U + 1/0 n ---> 141/56 Ba + 92/36 Kr + 3 1/0n <-------- 15. Which of the following has a ⅓ charge? (Points : 3) electron up quark <------ hadron down quark 16. You started with 64 g of a radioactive substance. If you have 4.0 g of that substance left, then how many half-lives have elapsed? (Points : 3) 5 4 <----- 3 2 17. If you started with 20.0 g of a radioisotope and waited for 3 half-lives to pass, then how much would remain? (Points : 3) 15.0 g 10.0 g 5.00 g 2.50 g <------ 18. For the transmutation shown, which of the following is X? 9/4 Be + 4/2 He → X + 1/0 n (Points : 3) 12/6 C <------ 13/5 B 13/6 C 5/2 He 19. The reaction depicted in the figure would take place in which of the following? http://takeexam.next.ecollege.com/ec/pub/K12Content/Courses/resources/swfs/media/Ninth_Grade/Science/Unit18364/Lesson71133/VHS_CHEM_S2_08_09_101_sodium_time_data_answer.jpg (Points : 3) fission reactor fusion reactor <------ radioisotope thermal generator medical X-ray device 20. Carbon inside a star is most likely formed by which process? (Points : 3) alpha emission beta emission fusion <---- fission more

Resolved Question: Help with Chemistry Problems!?

16. You started with 64 g of a radioactive substance. If you have 4.0 g of that substance left, then how many half-lives have elapsed? (Points : 3) 5 4 3 2 17. If you started with 20.0 g of a radioisotope and waited for 3 half-lives to pass, then how much would remain? (Points : 3) 10.0 g 5.00 g 2.50 g 1.25 g 18. For the transmutation shown, which of the following is X? http://www.flickr.com/photos/95218419@N05/8759125157/ 13 B 5 13 C 6 5 He 2 12 C 6 19. The reaction depicted in the figure would take place in which of the following? http://www.flickr.com/photos/95218419@N05/8759125097/ (Points : 3) fusion reactor radioisotope thermal generator medical X-ray device fission reactor 20. Sodium inside a star is most likely formed by which process? (Points : 3) alpha emission beta emission fission fusion more

Resolved Question: Help with Chemistry Problems?

6. Which of the following will stop gamma rays? (Points : 3) paper aluminum foil concrete skin 7. Which of the following symbols represents half-life? (Points : 3) alpha beta Ea t1/2 8. For the given transmutation, X is which of the following? 242 Cm + X → 245 Cf + 1 n 96 98 0 (Points : 3) 0 e -1 0 e +1 4 He 2 gamma 9. Which of the following requires a critical mass? (Points : 3) fission leptons beta emission gamma emission 10. Which of the following is a component of a proton? (Points : 3) neutron electron up quark gluon more

Resolved Question: Modern physics radioactivity help?

1. What type of ionizing radiation is emitted by the nuclear reaction shown? 53^131 I -> 54^131 Xe + -10^^0^e? (Points : 1) alpha particles beta particles gamma rays X rays 2. Which of the following processes is used in currently available, non-CO2-emitting power plants on the earth? nuclear fission nuclear fusion radioisotope thermal generators particle accelerators 3. Which of the following nuclear processes converts light elements into heavier ones? alpha emission beta emission fission fusion 4. If you have 10.0 g of a substance that decays with a half-life of 14 days, then how much will you have after 42 days? 0.10 g 0.31 g 1.25 g 2.50 g 5. You place a sheet of paper between you and a radioactive source, and all of the ionizing radiation gets blocked by the paper. What type of radiation is the source emitting? alpha particles beta particles gamma rays X rays more

Resolved Question: if you detect a large amount of xray emission from a group of stars what assumption can you make about its age?

Resolved Question: How is radio astronomy used to study galactic structure?

Voting Question: Help? ICP The waves with the longest wavelengths in the electromagnetic spectrum are?

____1.Electromagnetic waves vary in a.the speed they travel in a vacuum. b.wavelength and frequency. c.the way they reflect. d.the orientation of their electric and magnetic fields. ____2.Light acts like a.a wave.c.both a wave and a particle. b.a particle.d.neither a wave nor a particle. ____3.The waves with the longest wavelengths in the electromagnetic spectrum are a.infrared rays.c.gamma rays. b.radio waves.d.X-rays. ____4.The visible light spectrum ranges between a.radar waves and X-rays. b.television waves and infrared rays. c.infrared rays and ultraviolet rays. d.ultraviolet rays and gamma rays. ____5.Cellular telephones utilize a.radar waves.c.very low frequency waves. b.very high frequency waves.d.microwaves. ____6.X-ray photographs show softer tissue a.as invisible. b.as dark, highly exposed areas. c.the same as dense bones. d.as bright white areas. ____7.A translucent material a.scatters some light.c.absorbs all light. b.transmits all light.d.reflects all light. ____8.In order of increasing light-transmitting capabilities of materials, which is the correct sequence? a.transparentopaquetranslucent b.opaquetransparenttranslucent c.opaquetranslucenttransparent d.translucenttransparentopaque ____9.Which of the following occurs as a light wave bends when it passes from one medium into another? a.constructive interferencec.destructive interference b.refractiond.reflection ____10.Polarized sunglasses work by a.blocking light waves that vibrate in one plane. b.gradually refracting light as it passes through the lenses. c.bending light as it passes from air into the lenses. d.reflecting most of the light that strikes the sunglasses. ____11.Blue light and yellow light combine to produce white light because a.they absorb each other’s wavelengths. b.blue, yellow, and white are primary colors. c.they are complementary colors of light. d.they are both primary colors of light. ____12.The primary colors of light are a.green, blue, and black. b.cyan, magenta, and yellow. c.red, yellow, and blue. d.blue, green, and red. ____13.The primary colors of pigments a.are cyan, yellow, and magenta. b.are the same as the secondary colors of light. c.combine in equal amounts to produce black. d.all of the above ____14.Many streets and parking lots are illuminated with a.laser lights.c.sodium-vapor lights. b.tungsten-halogen lights.d.fluorescent lights. Completion 1.Electromagnetic waves are ____________________ waves consisting of changing electric and magnetic fields. 2.Warm objects give off more ____________________ radiation than cool objects give off. 3.Objects that scatter some of the light that is transmitted through them are ____________________. 4.When viewed in yellow light, an object that reflects all the colors of light will appear ____________________. 5.Combining equal amounts of the three primary pigments produces ____________________. 6.Light is produced when ____________________ change energy levels in an atom. 7.Microwaves have a higher ____________________ than radio waves have. 8.A transparent object ____________________ almost all of the light that strikes it. 9.An ultraviolet light wave has a wavelength of 200 nm and a frequency of 6.0 1014 Hz. The ultraviolet light is NOT traveling through a(an) ____________________. 10.In microwave cooking, heating only occurs near the ____________________ of the food. 11.A mirage, or distorted image, can be caused by the ____________________ of light as it moves into layers of hotter and hotter air. 12.White light passing through a prism separates into colors because of the differences in the ____________________ of each color of light. 13.Light amplification by stimulated emission of radiation is known as ____________________ light. 14.To form white light from the combination of only two colors of light, the colors must be ____________________. 15.The following electromagnetic waves are arranged in order of increasing frequency: more

Resolved Question: what is the average height and weight for a female?

i know it's different for many countries. i am caucasian and 5'7 1/2" and about 135lbs. what is the average height and weight for a female? i am 15, but ive finishede growing taller as the doctor says from results on my x-rays. i would be 5'9" but my scoliosis takes off a few inches. i do realize i could lose a few pounds off my hips and thighs... but what is the ideal height and weight for a female who is finished growing? more

Voting Question: Consider an x ray tube with copper used as the target metal.?

The wavelength of the K x ray-emission in nanometers? more

Resolved Question: X-ray bursts and gamma ray bursts have the same distribution pattern in the sky?

Is this true? I think it is, considering all gamma ray bursts are followed by x-ray emission more

Resolved Question: do flatscreen tvs have radiation?

say if i put a t-shirt around my tv where the sensor is and left it there and wore it will that have any affect? more

Resolved Question: atheists, why did we "evolve" into land animals when it makes more sense for us to stay in the water?

Wouldn't we have less hazards under water? Would we still be committing global warming if we remained a marine species? If evolution means we evolve, why do stupid decisions come from smart people? Where is proof that Darwin existed, I never met him?@lynn point, less hazards? Like hurricanes, gravity, tornadoes, how dangerous are earthquakes underwater? Fires? Was water pollution so bad that it was worth leaving?btw, for you others just wait until.i start with the SSM questions that you so love to troll us about.@ashton, aren't cow farts more dangerous than shark turds? If not, don't we breath air other people fart in?@ashton, haven't aquatic animals been the most enduring of all? I.e. Alligators and I don't care what anyone says, I believe plesiosaurs still exist. more

Resolved Question: astronomy questions- black holes, milky way, etc.?

If black holes are black and no light escapes, how do we infer that some black holes exist? A we measure the redshifts of light coming from them B we measure the time it takes material to fall in C we see dark spots on a lit-up background D we see the x-ray emission from material falling in E we listen for the screams of aliens getting sucked in What is the best evidence for dark matter in the Milky Way and other galaxies? A Stars in the Milky Way do not rotate around the center of the galaxy with the speeds we would expect if there were no dark matter B The black hole at the center of the Milky Way is super-massive and yet it is black C Other galaxies orbit the Milky Way in ways that do not make sense if there is no dark matter D Dark matter blocks x-rays and our x-ray view of the Milky Way is at odds with our optical view of the Milky Way E Dark matter interacts with the Earth gravitationally and so we need to correct for its presence when we calculate seasonal variations If the universe is infinite and life happens by chance then A an alien who is exactly like you in every conceivable way just got a perfect score on a perfect copy of this exam B a black hole somewhere just simultaneously swallowed a neutron star, a white dwarf, a grand piano, and three Walking Dead figures C an alien coin was flipped 10,000 times in a row and it came up skulls every single time D all of the above E none of the above more

Resolved Question: Chemistry help!! ASAP! PLEASE?

in radioactive decay 81rb is converted to 81kr with the emission of x-ray photon. What is the nature of the decay? beta electron gamma positron more

Resolved Question: What is the origin of Cataclysmic variables?

Thank you:) more

Resolved Question: Are there such a thing as a ultraviolet star?

That can't be detected in the "normal" human eye spectrum? But can be detected by "ultraviolet telescopes"? more

Resolved Question: Can hydrogen emits x-ray?

Resolved Question: Why does an excited atom lose a photon?

Never got the answer to this. more

Resolved Question: Which rays produce Photo electric effect? gamma rays, X-rays, Infrared, Visible?

its an MCQ. tell the correct one with reason.. but Im sure that gamma and X rays cannot produce photoelectric effect as they have high energy more

Resolved Question: Old CRT TV and Radiation?

My old CRT TV died not too long ago. The wooden unit that held the TV is now upstairs and in the room where my computer is, which I use a lot. I read that CRT TV's can give out ionizing radiation, my question is, and I know I might sound a little paranoid, but can the ionizing radiation stick to the wooden unit, and affect me while I am sitting next to the computer? The old TV itself is downstairs, and dead waiting to be disposed of properly. Is the wooden unit a danger to me in anyway because of the radiation from the TV? I should say that the wooden unit held the TV for a number of years, don't know if that will have any effect. more

Resolved Question: Which rays produce Photo electric effect? gamma rays, X-rays, Infrared, Visible?

as light produce photoelectric effect.. as far as i remember so whats the answer more

Resolved Question: Does Triboluminescence have a use?

Is there a practical use for triboluminescence or is it just useless or fun to play around with? more

Resolved Question: why are "smart" meters an assault against freedom (and health)?

https://skydrive.live.com/?cid=fff19b48ee821aa4&id=documents#cid=FFF19B48EE821AA4&id=FFF19B48EE821AA4!11212 ive saved a few radio podcasts for you to listen to help understand what the dilemma is all about. more

Resolved Question: Suggest threeways by which people working in nuclear establishments can be protected against nuclear radiation?

REST OF THE QUESTION - Why are nuclear wastes disposed in lead containers? more

Resolved Question: Name the 3 main types of electromagnetic radiation that radiate from the sun to the earth.?

Include percents and relative wavelengthsINCLUDE PERCENTS AND RELATIVE WAVELENGTHS more

Resolved Question: a question i got on global warming?

Well i am not a scientist or anything i havent really done so much studying in this.so im not claiming this is a fact or anything. But i was wondering today if now co2 controls the climate and the earth has been here for like 6 billion years wouldnt there be a shit ton of co2 that has been trapped in earth in all those years? like 6 billion years? more

Resolved Question: Can someone give me random Ideas for super powers for characters in my story?

All I need are random powers they don't have to be super powerful just powerful enough for some of my sub-characters. Now don't get me wrong here I know how to think of my own powers; it's just that I have already got plenty of powers for my characters and even a few semi-main characters. I'm at the bottom of my list and am running short of Ideas. I have one character that can transmute any inanimate into emerald shards ( I'm wondering if this is a good name for her Emerald Jade or if I should just use Jade or Emerald). I have another character who can control metal to a certain degree though not as powerful as Magneto ( I could use a name for him). Thanks to all who answer in advance. more

Resolved Question: Am I correctly understanding line-emission spectrum?

Keep in mind this is a general chemistry course at a CC, so it's not in depth like the Chemistry course I'll eventually take as required by the engineering curriculum. From my understanding, electrons exist in orbitals around an atom's nucleus. Those orbitals are defined by main levels and sub-levels (example: 1s, 2s, 2p, 3s, 3p, 3d, etc). When electromagnetic energy (photons) collide with these electrons, the electron's energy increases, moving it to an outer main level (say from 2 to 4). Then, when the electron moves back to it's original main level (from 4 to 2) it releases that energy in the form of visible light. Depending on the energy (5 to 2 would release more than 4 to 2), some wavelength of light is released, but it's all mixed together. When passed through a prism, it separates into a line-emission spectrum, where the energy the electron released corresponds to the wavelength, and thus the color. My only question is, if this is all true, how does electricity correspond to photons hitting the electron and then being released from the electron. What I mean is, in the example of neon gas, when electricity is passed through, the neon glows because of the process I mentioned above. But, if it's glowing because photons hit and are being released by the electrons, where do these photons come from? I was always under the impression that electricity consisted of electrons, static or otherwise. more

Resolved Question: Is radiation is the same as to electromagnetic wave?

Are they the same since they are both dangerous? more

Resolved Question: A solar model is used to calculate the expected temperature and density at all depths within the Sun. These re?

Observations of the total X-ray emission from the Sun’s corona Observations of neutrinos coming from the Sun Measurements of the varying number of sunspots on the Sun over time Measurement of the Sun’s mass Measurements of the Sun’s total energy output into space more

Resolved Question: Thoughts on this laptop?

http://www.ebay.co.uk/itm/Dell-Inspiron-17R-17-3-5720-Laptop-3RD-Gen-i7-3632QM-8GB-1TB-Bluetooth-Win-7-/271119005202?pt=Laptops_Nov05&hash=item3f1ff3b612 Display: 17.3" (1600 x 900) HD+ LED Display Memory: 8GB RAM DDR3 Processor: 2.2GHz Intel Core i7-3632qm 3.2GHZ TURBO MODE Video: Intel shared HD4000 Hard Drive: 1 TB 5400RPM I'll look up the clock speed, and probably upgrade the HHD speed. I'm a little concerned about the Intel shared HD4000. Does this mean that it doesn't have a dedicated graphics card? What are your general thoughts? - It's about £450 Thank you more

Resolved Question: which contributors about radioactivity is correct?

it is said in our questionnaire was which of the following contributions on radioactivity is/are correct? I - Wilhelm Conrad Roentgen discovered X-rays II - Antoine Henri Bacquerel discovered emissions of radiation by a material III - Pierre and Marie Curie discovered Polonium and Radium a. I & II only, b. I & III only, c. II & III only, and d. I, II and III please provide some information of why it is too. please. more

Resolved Question: why bohr mdel failed?

bohr atomic modil more

Voting Question: radioactivity, please help!!!!!!!!!!!?

A couple of questions, QUESTION 1. when uranium undergoes decay, does it always break apart into thorium and helium, in other words can it break apart into any number of elements, and if so what determines what it will break apart into? QUESTION 2 During beta emission when the electron gets emitted from the nucleus, does it enter an orbit of the atom, if so which energy level? Well since beta emission happens due to a high amount of neutrons to protons, how many more neutrons does there have to be than protons in order for beta emission to occur? QUESTION 3 Lets say there is an element with 2 electrons in the first energy level and 8 electrons in the second, now during gamma emission do all the electrons absorb energy from the photon and if so, can the electron from the first energy level jump up to the next or since it cant since the second energy level is filled, does any electron in the second energy level jump to a third energy level, and what determines which electron jumps the level? QUESTION 4 during positron emission when the positive electron gets emitted, does it make contact with any of the electrons in any of the elements orbitals and if so how big is the energy released, is it enough to knock all the other electrons out of orbit or what happens to the elements electrons or nucleus? QUESTION 5 during electron capture or gamma emission what determines when an electron releases energy and drops to the lower energy level what kind of energy is being released? is it always x rays released, what about photons being released, whats the difference?? more

Resolved Question: X-ray diffraction pattern from crystal?

To anyone who has done experiments in X-ray crystallography in the past. We are bomarding copper with high energetic electrons, thus forcing it to emits the K-alpha and K-beta characteristic radiations ( X-rays) and some background. These are shone on and scattered by a crystal. We detect the intensity of the diffraction pattern as a function of the angle of declination of the crystal. We get a graph with 2/3 sets of double peaks. This makes sense, since each doublet corresponds to the K-alpha and K-beta emission, and each set corresponds to when constructive interference occurs. What I don't get, is why these peaks get lower with angle. That it, at large angle of declination of the crystal, we get less intense peaks. WHYYYYY?ALso, could you please quote a reference, or sth OFFICIAL which is saying that? I've been looking all week but I haven't found anything. more

Resolved Question: Chemistry help!!!!!!!!!!?

A couple of questions, (5 specifically) QUESTION 1. when uranium undergoes decay, does it always break apart into thorium and helium, in other words can it break apart into any number of elements, and if so what determines what it will break apart into? QUESTION 2 During beta emission when the electron gets emitted from the nucleus, does it enter an orbit of the atom, if so which energy level??? Well since beta emission happens due to a high amount of neutrons to protons, how many more neutrons does there have to be than protons in order for beta emission to occur? QUESTION 3 Lets say there is an element with 2 electrons in the first energy level and 8 electrons in the second, now during gamma emission do all the electrons absorb energy from the photon and if so, can the electron from the first energy level jump up to the next or since it cant since the second energy level is filled, does any electron in the second energy level jump to a third energy level, and what determines which electron jumps the level? QUESTION 4 during positron emission when the positive electron gets emitted, does it make contact with any of the electrons in any of the elements orbitals and if so how big is the energy released, is it enough to knock all the other electrons out of orbit or what happens to the elements electrons or nucleus? QUESTION 5 during electron capture or gamma emission what determines when an electron releases energy and drops to the lower energy level what kind of energy is being released? is it always x rays released, what about photons being released, whats the difference???? more

Resolved Question: Chemistry Question: Radioactive decay please help!!!!!?

A couple of questions, (5 specifically) QUESTION 1. when uranium undergoes decay, does it always break apart into thorium and helium, in other words can it break apart into any number of elements, and if so what determines what it will break apart into? QUESTION 2 During beta emission when the electron gets emitted from the nucleus, does it enter an orbit of the atom, if so which energy level? Well since beta emission happens due to a high amount of neutrons to protons, how many more neutrons does there have to be than protons in order for beta emission to occur? QUESTION 3 Lets say there is an element with 2 electrons in the first energy level and 8 electrons in the second, now during gamma emission do all the electrons absorb energy from the photon and if so, can the electron from the first energy level jump up to the next or since it cant since the second energy level is filled, does any electron in the second energy level jump to a third energy level, and what determines which electron jumps the level? QUESTION 4 during positron emission when the positive electron gets emitted, does it make contact with any of the electrons in any of the elements orbitals and if so how big is the energy released, is it enough to knock all the other electrons out of orbit or what happens to the elements electrons or nucleus? QUESTION 5 during electron capture or gamma emission what determines when an electron releases energy and drops to the lower energy level what kind of energy is being released? is it always x rays released, what about photons being released, whats the difference???? more

Voting Question: If you know chemistry help me understand radiation please!!!?

Resolved Question: Can this theory on cancer treatment work?

Well my toilet at home gets clogged all the time. So I get a glass of water, press the button to make water come out and TRY to flush the poop ( LOL ) and fast I trow he glass from the air in the toilet and it goes down with no effort from that point. Can't that work with cancer treatment? Shoot the body with alpha rays slowly ( like normally ) and for a fast, one or two second period burst out alpha rays? HAs anyone tried that? That is just a theory :) Trying to do my best in society and helping. Planing on studying either medicine ( either cancer research or being a doctor for the police that looks at the dead bodies and says cause of death ) Thanks for answering in advance more

Resolved Question: Objects can emit waves?

Im just curious but, How do we observe a dull black object emitting out Radiation (Waves)? I know dull black objects are good absorbers and good emitters. Also, How do We transfer Energy (Radiation) from a object to a emitter (Laser) or Vice-Versa? Please provide good info on this very interesting topic. thank you. more

Resolved Question: what are quasars? m confused?

what makes them so shiny more

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Resolved Question: Energy of a H-like bound state?

So the Energy of a H-like bound state is given by: En = -(Z^2 . E1)/ n^2 where E1 = 13.6eV This would mean that the energy levels decrease as you go through the orbits? However I thought that as you go through the orbits the energy increases, that being, the closer the electrons are to the nucleus the less energy they have? This is what counts for the emission of x-rays when the electrons of higher energy drop into lower energy orbits? There seems to be a contradiction there, could someone maybe explain what's going on? more

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