A photon of light enters a block of glass after travelling through vaccum. The energy of the photon on entering the glass block

Options

A. increases because its associated wavelength decreases
B. Decreases because the speed of the radiation decreases
C. Stays the same because the speed of the radiation and the associated wavelength do not change
D. Stays the same because the frequency of the radiation does not change

Answer

D

Explanation

Frequency of light does not change with medium.