If $c$ is the velocity of light in free space, the correct statements about photon among the following are :
A. The energy of a photon is $E = h\nu$.
B. The velocity of a photon is $c$.
C. The momentum of a photon, $p = \dfrac{h\nu}{c}$.
D. In a photon-electron collision, both total energy and total momentum are conserved.
E. Photon possesses positive charge.
Choose the correct answer from the options given below :
Answer: (D) A, B, C and D only
A: $E = h\nu$. Correct.
B: Photons travel at speed $c$ in free space. Correct.
C: $p = \dfrac{E}{c} = \dfrac{h\nu}{c}$. Correct.
D: A photon-electron collision (as in the Compton effect) conserves both total energy and total momentum. Correct.
E: Photons are electrically neutral. Incorrect.
So A, B, C and D only.
Solution by Sreeraj P, M.Sc Physics