Q. The wavelength $\lambda$ of the $K_{\alpha}$ line of characteristic X-rays spectra varies with atomic number approximately
A) $\lambda \propto Z$
B) $\lambda \propto \sqrt{Z}$
C) $\lambda \propto \frac{1}{Z^{2}}$
D) $\lambda \propto \frac{1}{\sqrt{Z}}$
Explanation
(c) According to Mosley’s law $v = a(Z - b)^{2}$ and $v \propto \frac{1}{\lambda}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.