Q. $X$-rays of which of the following wavelengths are hardest
A) $4\ \mathring{\mathrm{A}}$
B) $1\ \mathring{\mathrm{A}}$
C) $0.1\ \mathring{\mathrm{A}}$
D) $2\ \mathring{\mathrm{A}}$
Explanation
(c) $v_{\max} \propto \frac{1}{\lambda_{\min}}$ Hard $X$-rays have high frequency and low wavelength
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.