Rays Definition and 315 Threads

http://arxiv.org/PS_cache/arxiv/pdf/0804/0804.1938v1.pdf

Are cosmic rays electromagnetic rays coming down from outer space? I've also read they are actually 90 percent protons, but I'm not sure what they are now. Thanks in advance.

Hello, I have got a assignment... there is a question what is the electron and beta rays? i have searched a lot but i cannot undersatnd it..can someone please explain me..I shall be thankful to you.. regards, samar

Our atmosphere? Our atmosphere protect us from the cosmic rays what it consist of(the cosmic rays and the atmosphere)? How much is its power? How it (the atmosphere) stop these rays? What happened in high level of the atmosphere to stop it? What are the best gases (in the atmosphere) that...

Hey here is the question I have to answer... What is the principal difference between light and an X-ray? I thought that X rays have short wavelengths, and light has long? Thanks

Can anyone point to the current state of research about the relationship between antimatter clouds and gamma rays, specifically gamma ray bursts? There was a science.com article quoted in a Yahoo news story. If anyone has read the article, does it say anything pertinent on this question?

The Danish scientist Henrik Svensmark has been scorn for several years now because of his alternative explanation of how Earth's temperature varies. His theory states this: High solar activity is a sign of a strong magnetic field from the sun -> Strong magnetic field from the sun will decrease...

When two rays of different colors of light cross each other what color is projected on the wall? Say for example, red light, and green light cross each other, what is the ultimate color projected on the wall? Why don't the colors get mixed up?

Any suggestion about an introductory book on cosmic rays?

Why do all rays coming from far off distance from a source(may be planar)... converging at a point need to travel the same Optical Path Length(OPL)

How do escape peaks occure? I mean peaks originating from a gamma ray located at the Energy value of \ E_{peak} \equiv E_{gamma}-511KeV. I read that an annihilation process takes place and one of the annihilation photons escapes detection.To arive at detecting an Energy of E_{peak} the...

Homework Statement I'm trying to find the focal length of the diverging lens. The converging lens is 24cm behind a diverging lens. The focal length of the converging lens is 31cm. I know that parallel light strikes the diverging lens and then affter passing through the converging lens the...

In case people hasn't seen the big news of the day (or technically, the big news of tomorrow when the issue of Science officially comes out), the Pierre Auger observatory collaboration has finally come out with its first major result. I am not in this field of study, but I am involve with it...

I don't know if you've heard the latest news from the MAGIC telescope researchers, but they may possibly have come across evidence of Quantum Foam: http://www.universetoday.com/2007/10/03/high-energy-gamma-rays-go-slower-than-the-speed-of-light/ Gamma rays were apparently found to have...

http://www.universetoday.com/2007/10/03/high-energy-gamma-rays-go-slower-than-the-speed-of-light/ Bad news or bad journalism?

Do all types of supernovae emit gamma rays? If so, is it an initial burst, or does the GRB last as long as the visible light? If so, is the GRB in all directions or just in jets? Thanks.

Someone told me that the film badges used in nuclear plants respond to microwave radiation from microwave ovens, as well as to the ionizing radiation they're intended for. I don't understand how this could work. Can someone explain it, or is it just not true?

this isn't HW, it is more for myself, I don't want answers or links to arvix papers... I am stuck and I just need something to help me proceed... a 10^20 ev proton strikes the atmosphere a km up and creates a vertical down to the ground, the energy is evenly distributed along this vertical...

Hello you guys. I was wondering about the energy limits of the gamma rays. I allready know that the gamma ray spectrum varies from some MeV to 50 MeV (approximately). Does anyone know how can these limits be justified?

IF nothing can escape from a black hole's event horizon, then how do x-rays and Gamma rays escape? and how does it emits light? it says in "Brief History of Time" that the light it emits is just at the boundary of the event horizon. So then how does it escape the gravity and reach earth...

Homework Statement I have a doubt in the following problem. I get an answer which is slightly different from the book answer. 1) A 6 MeV gamma ray is absorbed and dissociates a deuteron into a proton and a neutron. If the neutron makes an angle of 90 degrees with the direction of gamma ray...

Rays from the sun subtend an angle theta (in radians) at the pole of a convex mirror (in radians) at the pole of a mirror of focal length f. If the diameter of the sun is D ,then diameter of the image of the sun formed by the mirror is: (a) f theta (b) 2 f theta (c) 6 f theta (d) none...

Homework Statement A light ray enters a piece of glass at the angle a1 = 10 degrees. We measure it's refraction angle a2 = 15 degrees. With this information we find the velocity of the light ray in the glass. Homework Equations 1. (sin a1 / c1) = (sin a2 / c2) 2. n-glass = (sin a1 x...

Could ultra high-energy cosmic rays be the result of matter-antimatter collision? What would be a unique antimatter-matter anihilation signature should say a 10 gram rock of antimatter were to collide into a meteor?

Even though in optics experiments we assume that the sun rays are parallel, we can clearly see that the sunlight seems to diverge from the sun when coming through the clouds. Whats the reason of this discrepancy?

Homework Statement Why are gamma rays potentially more dangerous than either alpha particles or beta particles? Homework Equations none The Attempt at a Solution Is it because gamma rays travel more distance before ionising matter so when a gamma ray is fired at you, it could get...

Anyone know the future uses of x rays within a hospital? or what the future adaptations are to make it less harmful etc? help! xx

neutrinos are like electrons but not charged. its partner in the subatomic universe. no charge and subsiquently no mass. http://www.ps.uci.edu/~superk/neutrino.html part of the electromagnetic spectrum?? gamma rays are also electrons, no charge and no significant mass. part of the...

How can Gamma rays be used as a projectile ? It need s the nucleus to be extremely unstable.Please give description as well as examples.of such reaction.

Questions, questions, questions... I hope some one can answer these questions. thank you. :) 1. Describe the process of Compton Scattering, explaining carefully how both attenuation and absorption of X-rays occur. 2. How does the process of Compton scattering of X-rays depend on the nature...

What is the factor that determines whether an object will be transparent, translucent, or opaque? Also, what makes reflecting surfaces reflect EM rays?

Since gamma rays are much more energetic, then shouldn't they travel faster. Gamma rays are light, but since they are faster shouldn't they travel faster than c?

I read an article in this months Discover magazine that stated that cosmic rays are atoms of the elements from hydrogen up to iron traveling at close to the speed of light that originate from exploding stars. Can the mass of cosmic rays be calculated for the universe? Is it a constant? As some...

How fast do X rays travel in a vacuum? m/s

Are cosmic rays part of the EMS (Electromagnetic spectrum)? I have seen duagrams showing that cosmic rays are part of the EMS and I have heard conflicting reports that cosmic rays are not part of the EMS. I know cosmic rays are energetic nuclei and have mass so I tend to believe that they are...

I need some help with light rays. I've been sick and missed the last few days so I need a little help. I have some questions that I have to submit online by tomorrow. I was wondering if someone could help. 1) A ray of light strikes a plane mirror at a 45° angle of incidence. The mirror is then...

Wasn't quite sure where to post this considering it talks about 2 subjects, but i guess this is a good place to start. My question is: How [if at all] can high energy EM waves affect electronic systems? More specifically gamma rays. I am by no means an electro-physicist, cosmic radiation is...

Am I right in understanding that Gamma Rays can decay into an electron-positron pair without interacting with any matter as indicated by Bubble Chamber results?

can electromagnetic shielding in space protect humans (for a long period) from gamma radiation?? i:rolleyes:

Is "Effects of UV Rays' a good topic in research?

Gamma Rays of wavelength 0.710 Angstrom are scattered in a thin foil of Aluminium. The scattered radiation is observed at an angle of 60 degree from the incident direction. What wavelength would u expect to see? Thanks in advance

Hi, I'm new. I read aboot how an electron, and a positron colliding is supposed to produce two separate gamma rays in completely opposite directions 180 deg away from each other. I understand that the gamma rays are supposed to correspond perfectly to the mass of the particles involved. I am...

I just did a test yesterday and there was a question about cathode ray tubes, it went soemthing liek this. Albert calutated the charge to mass ratio of the cathode rays to be 1.3*10^11 and his velocity to be 3*10^8. His answers didnt agree to that of the textbook. Marie another student...

Hi I am looking for a website which explains the use of Moseley's Law for calculating parameters for characteristic X-ray spectra (in particular K_{\alpha} lines and the compliance with Bohr's formula (modified). Searched google but didn't find anything comprehensive enough. Eagerly...

Does anyone know where I can find sites that explain how lasers & X - rays are related to the quantum mechanical model.

http://space.com/scienceastronomy/AAS_cosmic_rays_050117.html Quote from article... "Cosmic rays are not actually rays, like light. They are instead subatomic particles, thought to be mostly protons, on of the fundamental units of matter. The highest-energy versions of them race across the...

X-ray energies increase with atomic number, Z. X-rays originate from photon emissions as electrons drop back into the K and L shells of atoms. Thus they have characteristic wavelengths. Hydrogen has the lowest energy X-rays (Ek=13.6 eV) which is the first ionzation potential. It has one...

Ok, so we all know that the shorter the wavelength, the higher the frequency, and the higher the photon energy for EM radiation. How does this relationship explain why X rays are highly dangerous to living things, and radio waves are not? Thanks in advance.

which one's infra rays wavelength are longer, sun or human body?

Hi all, please can anyone enlighten me to if far infra rays are still emitted in darkness? Does natural light enhance the rays? Many thanks.. Col :smile: