Q. The atomic number and the mass number of an atom remains unchanged when it emits
A) a photon
B) a neutron
C) $\beta -$particle
D) An $\alpha -$ particle
Explanation
(a) When a $\gamma - ray$ photon is emitted then atomic number and mass number remains unchanged.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.