Q. $X$-rays are produced by accelerating electrons by voltage $V$ and let they strike a metal of atomic number $Z.$ The highest frequency of $X$-rays produced is proportional to
A) $V$
B) $Z$
C) $(Z - 1)$
D) $(Z - 1)^{2}$
Explanation
(d) According to Mosley’s law $v \propto (Z - b)^{2}$
For $k_{\alpha}$ line, $b = 1,$ and it has maximum frequency so $v_{\max} \propto (Z - 1)^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.