Q. The mass of an $\alpha$-particle is
A) Less than the sum of masses of two protons and two neutrons
B) Equal to mass of four protons
C) Equal to mass of four neutrons
D) Equal to sum of masses of two protons and two neutrons
Explanation
(a) This is due to mass defect because a part of mass is used in keeping the neutrons and protons bound as $\alpha -$particle
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.