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 Sub Topics Photons of light are produced when a charged particle travels through a transparent medium at a speed greater than the speed of light in that medium. The medium may be a gas, liquid or solid. These photons are referred to as Cherenkov radiation in honor of the Russian physicist Pavel A. Cherenkov for his discovery of this unique radiation and his basic research to measure the properties of the radiation and the phenomenon upon which the radiation finds its origin, now referred to as the Cherenkov effect.

## Definition

• The yield of Cherenkov radiations per unit wavelength is proportional to $\frac{1}{\lambda^{2}}$. Therefore, the emission is concentrated in the short wavelength region of the spectrum. At extremely short wavelengths, the yield gradually drops off because the refractive index (as a function of wavelength) approaches to unity.