Q. The essential distinction between $X$-rays and $\gamma$-rays it that
A) $\gamma -$rays have smaller wavelength than $X$-rays
B) $\gamma -$rays emanate from nucleus while $X$-rays emanate from outer part of the atom
C) $\gamma -$rays have greater ionizing power than $X$-rays
D) $\gamma -$rays are more penetrating than $X$-rays
Explanation
(b) The wavelength of the $\gamma$-rays is shorter. However the main distinguishing feature is the nature of emission
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.