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An electron makes a transition from an excited state to the ground state of a hydrogen - like atom. Then
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its kinetic energy increases but potential energy and total energy decrease
$\begin{aligned}
U=-K \frac{z e^{2}}{r} ; T . E=-\frac{k}{2} \frac{z e^{2}}{r} \\
K . E=\frac{k}{2} \frac{z e^{2}}{r} . \text { Here } r \text { decreases }
\end{aligned}$
U=-K \frac{z e^{2}}{r} ; T . E=-\frac{k}{2} \frac{z e^{2}}{r} \\
K . E=\frac{k}{2} \frac{z e^{2}}{r} . \text { Here } r \text { decreases }
\end{aligned}$
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