Q. What is the mass of a photon of sodium light with a wavelength of 5890 $A^{{^\circ}}$?($h = 6.63 \times 10^{- 27}$ erg-s)
A) 5.685$\ \times 10^{- 33}$ g
B) 6.256$\ \times 10^{- 33}$ g
C) 4.256$\ \times 10^{- 33}$ g
D) 3.752$\ \times 10^{- 33}$ g
Explanation
(d)
$\lambda = \frac{h}{mc}$ or $m = \frac{h}{\lambda c}$
$= \frac{6.63 \times 10^{- 27}}{5890 \times 10^{- 8} \times 3 \times 10^{10}}$
$= 3.752 \times 10^{- 33}\$g
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.