Q. Four particles have same momentum. Which has maximum kinetic energy?
A) Proton
B) Electron
C) Deuteron
D) $\alpha$- particle
Explanation
(b) $KE = \frac{p^{2}}{2m}$
Momentum is same, so KE$\propto \frac{1}{m}$
Out of the given choices, mass of electron is minimum, so its KE will be maximum.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.