Q. The minimum wavelength of $X$-ray emitted by $X$-rays tube is $0.4125\ \mathring{\mathrm{A}}.$ The accelerating voltage is
A) $30\ kV$
B) $50\ kV$
C) $80\ kV$
D) $60\ kV$
Explanation
(a) $\lambda_{\min} = \frac{12375}{V}\mathring{\mathrm{A}} \Rightarrow V = \frac{12375}{0.4125} = 30\ kV$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.