Q. The ratio of the energy of an $X$-ray photon of wavelength $1\ \mathring{\mathrm{A}}$ to that of visible light of wavelength $5000\ \mathring{\mathrm{A}}$ is
A) 1 :5000
B) 5000 :1
C) $1:25 \times 10^{6}$
D) $25 \times 10^{6}$
Explanation
(b) Energy $E = hv = h\frac{c}{\lambda}\ \therefore\frac{E_{1}}{E_{2}} = \frac{\lambda_{2}}{\lambda_{1}} = \frac{5000}{1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.