For 10 points, identify this radiation emitted by a body that is traveling faster than the speed of light in that medium, and is named for a Soviet physicist.
The HESS project uses this effect to detect gamma rays, and the orientiation of it relative to the particle path is used in RICH detectors. The equation governing it states that the energy losses per unit distance are given as the integral over applicable frequencies of 1- the inverse of beta square times the dielectric constant. That formula was developed by Ilya Frank and Igor Tamm. Its namesake observed it while he was working under Vavilov, and it is responsible for the blue glow that can be seen near nuclear reactors. For 10 points, identify this radiation emitted by a body that is traveling faster than the speed of light in that medium, and is named for a Soviet physicist.
The HESS project uses this effect to detect gamma rays, and the orientiation of it relative to the particle path is used in RICH detectors.
{Cerenkov} radiation [or {Cherenkov} radiation]