Q. The energy of an X-ray photon of wavelength $1\mathring{\mathrm{A}}$ is $(h = 6.6 \times 10^{- 34}J - s)$
A) 24.6 keV
B) 6.1 keV
C) 12.3 keV
D) 1.2 keV
Explanation
(c) The energy of X-ray photon, $E = \frac{hc}{\gimel}$
= $\frac{6.6 \times 10^{- 34} \times 3 \times 10^{8}}{1 \times 10^{- 10}}\ J = \frac{1.98 \times 10^{- 15}}{1.6 \times 110^{- 19}}$
= 12.3 keV
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.