Q. An X-ray has a wavelength of $0.010\ \mathring{\mathrm{A}}.$ Its momentum is
A) $2.126 \times 10^{- 23}kg$-$m/s$
B) $6.626 \times 10^{- 22}kg$-$m/s$
C) $3.456 \times 20^{- 25}kg$-$m/s$
D) $3.313 \times 10^{- 22}kg$-$m/s$
Explanation
(b) $p = \frac{h}{\lambda} = \frac{6.6 \times 10^{- 34}}{0.01 \times 10^{- 10}} = 6.6 \times 10^{- 22}kg - m/s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.