Question

The momentum of a photon of energy 1 MeV in kg m/s, will be :

• A. 0.33 x 106
• B. 8 x 10-24
• C. 5 x 10-23
• D. 5 x 10-22

Answer 1

Answer: (D)

5 x 10-22

Answer 2

The momentum of a photon can be calculated using the formula: p =$\frac{E}{c}$, where E is the energy and c is the speed of light.
Given that the energy is 1 MeV (1 MeV = 1.6 x 10-13 Joules) and the speed of light is approximately 3 x 108 m/s, we can calculate p as follows:

p = $\frac{(1.6 x 10^{-13} J)} {(3 x 10^8 m/s) }$= 5.33 x 10-22 kg m/s.

Therefore, the correct option is (D): 5 x 10-22