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Cerenkov radiation is observed from a beam of 700 Mev electrons travelling through air of index of refraction n equals 1.00029 Find the half angle of the light cone of radiation?
Wiki User
∙ 10y ago
First, one finds the beta factor associated with e = 700 MeV. We have 700 MeV/0.511 MeV = gamma = 1369.86 = 1/(1-b^2)^1/2 => b = 0.9999994671.
Next, since cos (theta) = 1/(nb) = 0.999710, theta = 1.38 degree.
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∙ 10y ago
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When electrons travel faster than the speed of light in a particular medium a beautiful deep-blue light occurs This effect is called?
Cerenkov radiation.
What makes uranium glow?
Until the florescences is done with the Uranium it will not emit or glow in the dark . Though it is a radioactive substance it should be added with a florescence agent that will give the ability to shine in the dark.
At what speed does a beta ray travel?
There's no such thing. Or, rather, it depends on the circumstances. It has to be less than the speed of light in a vacuum, but other than that restriction, it can be almost any value (including faster than the speed of light in the medium it's traveling in, in which case it emits Cerenkov radiation).
Is relative speed of light constant?
The speed of light in a vacuum is absolute, unchangeable and can't be exceeded. The speed of light anywhere else depends on the material it moves through. c is indeed the c in e=mc2 - it is also the speed of light in vacuo. Any material has a speed of light associated with it, but that speed is not c, and that speed is neither a fundamental constant nor a universal speed limit. Photons are limited to that speed while in the material - that is what causes refraction. Material particles (those with mass) are not subject to the speed limit, any more than a rifle bullet is limited by the speed of sound. When a rifle bullet passes close to you, you hear a crack; this has the same origin as the sonic boom from an aircraft going supersonic. If a material particle that is travelling at close to c enters a material where the speed of light is less than the speed of the particle a shock wave is generated which is closely analagous to the sonic boom. There is no sound, just electromagnetic radiation, known as Cerenkov radiation. If you ever get a chance to observe a University reactor, almost all of which are water moderated, look down into the pool and admire the beautiful blue-green light surrounding the reactor core. That is Cerenkov radiation, caused by particles produced by the reactor going faster than the speed of light in water. As the particles bleed off energy into e-m radiation, they slow down. Once they are below the speed of light in water the Cerenkov production stops. It normally takes only a few feet.
What is the color of radon?
In the gaseous (normal) state, radon is a colorless gas, as is true of all noble gases (see: xenon, krypton, neon, argon, helium). Due to its high radioactivity a radon light is impractical, but if one were constructed it would glow yellow-green. In the solid state, things get very interesting with radon. As radon solidifies, it glows yellow, and then with decreasing temperature, glows an angry orange-red. This glow, or nightshine, comes from the Cerenkov light -- a product if radon's intense radioactivity. Needless to say, if you ever are viewing a glowing radon tube, you had best be standing behind very thick leaded glass.
Are cerenkov radiation harmful?
Cerenkov radiation is also spelled as Cherenkov is an electromagnetic radiation that comes for particles as they travel at speeds greater that the speed of light. The radiation if seen is often blue and is not harmful.
When electrons travel faster than the speed of light in a particular medium a beautiful deep-blue light occurs This effect is called?
Cerenkov radiation.
What has the author JV Jelley written?
J.V Jelley has written: 'Cerenkov radiation, and its applications' -- subject(s): Radiation
is cerenkov radiation harmful?
Cherenkov radiation is seem by the naked eye is a bright blue it is not considered to be harmful. The Cherenkov radiation is generating from electromagnetic radiation that comes from the speedo of particles traveling.
What is the index of refraction for liquid deuterium?
The value for the refractive index of Deuterium at 24.2K and at 3200 Angstrom, is given as 1.1321. As measured using the Cerenkov effect.
Is radioactivity blue?
No. It's not green either. Radioactivity is invisible. There's a blueish-green glow (more blue than green) due to something called Cerenkov radiation that's sometimes associated with radioactive objects. But that's just ordinary blue(ish) light, not "radioactivity". (It's still "radiation", of course, as is all other light.)
What makes uranium glow?
Until the florescences is done with the Uranium it will not emit or glow in the dark . Though it is a radioactive substance it should be added with a florescence agent that will give the ability to shine in the dark.
At what speed does a beta ray travel?
There's no such thing. Or, rather, it depends on the circumstances. It has to be less than the speed of light in a vacuum, but other than that restriction, it can be almost any value (including faster than the speed of light in the medium it's traveling in, in which case it emits Cerenkov radiation).
What are some light sources?
(Includes answer to the question "Name ten sources of (visible) light") All light originates in the emission of photons from electronic or nuclear processes, however those processes come in a variety of flavors, such as: 1. Thermal emission, consisting of "black body" radiation from hot objects such as incandescent light bulb filaments, and many other examples. 2. Molecular emission, such as that from hot gases in the flame of an oxyacetylene torch. 3. Phosphorescence, the delayed emission of light from a material after it has been stimulated, such as from the screen of a CRT tube after it is bombarded by electrons. 4. Fluorescence, the direct emission of light by some substances when they are stimulated by electrons or electric currents, such as an ordinary fluorescent light bulb. 5. Bioluminescence, such as the light emitted by Fireflies by means of chemical processes. Other examples include certain worms and fish. 6. Chemiluminescence, light emitted in chemical reactions other than in living things. 7. Sonoluminescence, light emission by the collapse of tiny bubbles in a fluid stimulated by sound waves. 8. Cerenkov or Cerenkov radiation, which is emitted when particles move faster than the speed of light through a medium (not faster than the speed of light in a vacuum). 9. Spontaneous emission, such as in a Light Emitting Diode (solid state) or Neon Bulb (Gaseous state) when stimulated by an electric current. 10. Stimulated emission, such as a laser. 11. Scintillation, a variation of fluorescence in which, for example, some substances emit light when struck by a subatomic particle. 12. Cyclotron radiation, which occurs when electrons are decelerated, whether in a straight line or by curving, as in a Cyclotron. (Partially adapted from the entry on "Light" on Wikipedia.)
How are people who work with radioactive materials protected?
By shielding them using a material which blocks the radiation. Exactly what that material is varies depending on the intensity and nature of the radiation, but a fairly thin layer of a dense material like lead, or a somewhat thicker layer of a less dense material like water, is generally sufficient. This can take the form of built-in shielding in the walls, heavy clothing lined with lead foil, helmets with leaded glass visors, or even more creative approaches.For example, in a "pool-type" research reactor, the core is at the bottom of a deep "swimming pool", with maybe thirty feet of water between you and the radioactive material, which is enough to screen out all but a tiny fraction of the radiation (you can, however, actually see the core surrounded by the blue glow produced by Cerenkov radiation, which is kind of cool).Also, most places where radioactive material is known to be present require everyone who might be exposed to wear a "dosimeter", which is an indicator of the amount of radiation received. That way, they can track total exposure over time, and someone who is getting toward the top of the permissible range is usually assigned elsewhere for a while. There also may be dosimeters mounted in the facility itself that sound an alarm or even physically seal off areas when abnormal radiation intensities are detected.
Is relative speed of light constant?
The speed of light in a vacuum is absolute, unchangeable and can't be exceeded. The speed of light anywhere else depends on the material it moves through. c is indeed the c in e=mc2 - it is also the speed of light in vacuo. Any material has a speed of light associated with it, but that speed is not c, and that speed is neither a fundamental constant nor a universal speed limit. Photons are limited to that speed while in the material - that is what causes refraction. Material particles (those with mass) are not subject to the speed limit, any more than a rifle bullet is limited by the speed of sound. When a rifle bullet passes close to you, you hear a crack; this has the same origin as the sonic boom from an aircraft going supersonic. If a material particle that is travelling at close to c enters a material where the speed of light is less than the speed of the particle a shock wave is generated which is closely analagous to the sonic boom. There is no sound, just electromagnetic radiation, known as Cerenkov radiation. If you ever get a chance to observe a University reactor, almost all of which are water moderated, look down into the pool and admire the beautiful blue-green light surrounding the reactor core. That is Cerenkov radiation, caused by particles produced by the reactor going faster than the speed of light in water. As the particles bleed off energy into e-m radiation, they slow down. Once they are below the speed of light in water the Cerenkov production stops. It normally takes only a few feet.
What actors and actresses appeared in Race to Mars - 2007?
The cast of Race to Mars - 2007 includes: Elisa Bourreau as Lucia Alarcon Claudia Ferri as Lucia Alarcon Macha Grenon as Lynn Erwin Kevan Ohtsji as Hiromi Okuda Michael Riley as Rick Erwin Frank Schorpion as Mikhail Cerenkov Stephen Shellen as Mission Controller Vlasta Vrana as Space Agency Narrator
