Atoms And Nuclei Question 16
Question: The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge [MP PMT 1987]
Options:
A) $ \frac{e^{2}}{r^{2}} $
B) $ \frac{e^{2}}{2r} $
C) $ \frac{e^{2}}{r} $
D) $ \frac{e^{2}}{2r^{2}} $
Show Answer
Answer:
Correct Answer: B
Solution:
Potential energy of electron in nth orbit of radius r in H-atom $ U=-\frac{e^{2}}{r} $ (in CGS) ∵ K.E. $ =\frac{1}{2}|P.E.| $
Þ $ K=\frac{e^{2}}{2r} $
