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If the electron of a hydrogen atom is present in the first orbit, the total

energy of the electron is
1)e2/r 2)e^2/r^2 3)e^2/2r 4)e^2/2r^2


It is option c)e^2/2r It is equal to the kinetic energy of the electron which is Ze^2/2r Z for hydrogen atom is 1 So answer is option (c) Hope it helps:)
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