Q.

The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge)

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a

e2r2

b

e22r

c

e2r

d

e22r2

answer is B.

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Detailed Solution

Potential energy of electron in nth orbit of radius r in H-atom U=-e2r(in CGS) ∵ K.E =12|P.E.| ⇒K=e22r
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The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge)