When an electron moving at a high speed strikes a metal surface, which of the following are possible?
(i) The entire energy of the electron may be converted into an X-ray photon
(ii) Any fraction of energy of the electron may be converted into an X-ray photon
(iii) The entire energy of the electron may get converted to heat
(iv) The electron may undergo elastic collision with the metal surface

Options

A. (i),(ii),(iii)
B. (ii),(iii),(iv)
C. (i),(iii),(iv)
D. all

Answer

A