Often considered the electromagnetic equivalent of a sonic boom, it is emitted when charged particles move faster than the speed of light in an insulator.
A special case of this effect occurs in the presence of a periodic surface like a diffraction grating, and is called the Smith-Purcell effect. The Super Kamiokande uses this effect to detect neutrinos, and the amount of it emitted is given in terms of the permeability and index of refraction of that medium in the Frank Tamm formula. Often considered the electromagnetic equivalent of a sonic boom, it is emitted when charged particles move faster than the speed of light in an insulator. For 10 points, identify this radiation that produces a characteristic blue glow, named for a Russian physicist.
A special case of this effect occurs in the presence of a periodic surface like a diffraction grating, and is called the Smith-Purcell effect.
{Cherenkov} radiation