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The energy of electron in an atom is giv...

The energy of electron in an atom is given by En =

A

` - (4pi^2 me^2)/(n^2 h^2)`

B

`- (2pi^2 me^2)/(n^2 h^2)`

C

`- (2pi^2 me^2)/(n^2 h^2)`

D

`- (2pi^2 me^4)/(n^2 h^2)`

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