Question

If c is the velocity of light in free space, the correct statements about photon among the following are:

1. The energy of a photon is E = hv.
2. The velocity of a photon is c.
3. The momentum of a photon, ρ = `(h v)/c`
4. In a photon-electron collision, both total energy and total momentum are conserved.
5. Photon possesses positive charge.

Choose the correct answer from the options given below:

Options

• A, C and D only

• A, B, D and E only

• A and B only

• A, B, C and D only

Answer 1

A, B, C and D only

Explanation:

E = hv, hence the statement A is correct.

A photon travels at the speed of light (c), hence statement B is correct.

Momentum of a photon is `(hv)/c`, so the statement is correct.

In a photo-electron collision, total energy and momentum are conserved. Statement D is correct as well.

Photons are electrically neutral and are massless. Hence, statement E is incorrect.