Which of the following is correct statement

Options

A. There are materials which absorb photons of shorter wavelength and emit photons of longer wavelength
B. There are substances which absorb photons of large wavelength and emit light of shorter wavelength.
C. For all the electrons that absorb a photon come out as photoelectrons
D. In photoelectric emission photon may have momentum in a different direction than the emitted electrons.

Answer

A, D

Explanation

1.In case or stable material, this is not possible because, to absorb a photon of larger wavelength and emit a photon of shorter wavelength, energy has to be supplied by the material.
2.Not all the electrons that absorb a photon come out as photoelectron because most of electrons get scattered into the metal.Only those electrons come out as photoelectrons whose energy becomes greater than work function of metal.