Q. The momentum of a photon in an $X$-ray beam $10^{- 10}$ metre wavelength is
A) $1.5 \times 10^{- 23}kg - m/s$
B) $6.6 \times 10^{- 24}kg - m/s$
C) $6.6 \times 10^{- 44}kg - m/s$
D) $2.2 \times 10^{- 52}kg - m/s$
Explanation
(b) Momentum of photon
$p = \frac{h}{\lambda} = \frac{6.6 \times 10^{- 34}}{10^{- 10}} = 6.6 \times 10^{- 24}kg - m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.