Question

What is the momentum of photon of energy 3 mev in kg ms^-1?

Options

• 1.5 × 10^-19 kg ms^-1

• 1.6 × 10^-21 kg ms^-1

• 7 × 10^-16 kg ms^-1

• 8 × 10^-17 kg ms^-1

Answer 1

1.6 × 10^-21 kg ms^-1 

Explanation:

P = `E/C = (3 xx 1.6 xx 10^-13)/(3 xx 10^8)`

= 1.6 × 10^-21 kg ms^-1