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Question

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

A
e2r2
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B
e22r
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C
e2r
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D
e22r2
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Solution

The correct option is B e22r
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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