Q. As the electron in Bohr orbit of Hydrogen atom passes from state $n = 2$ to $n = 1$, the kinetic energy $K$ and potential energy $U$ change as
A) $K$ two-fold, $U$ four-fold
B) $K$ four-fold, $U$ two-fold
C) $K$ four-fold, $U$ also four-fold
D) $K$ two-fold, $U$ also two-fold
Explanation
(c) $U = 2E,K = - E$ and $E = - \frac{13.6}{n^{2}} = eV$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.