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The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge) |
$\frac{e^2}{r^2}$ $\frac{e^2}{2 r}$ $\frac{e^2}{r}$ $\frac{e^2}{2 r^2}$ |
$\frac{e^2}{2 r}$ |
Potential energy of electron in $n^{\text {th}}$ orbit of radius r in H-atom $U=-\frac{e^2}{r}$ (in CGS) ∵ K.E. = $\frac{1}{2}|P . E .| \Rightarrow K=\frac{e^2}{2 r}$ |
