As an electron makes a transition from an excited state to the ground state of a hydrogen - like atom/ion:

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(D) its kinetic energy increases but potential energy and total energy decrease

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\({\text{U}} = - {\text{K}}\frac{{{\text{z}}{{\text{e}}^2}}}{{\text{r}}}\) ; \({\text{T}} \cdot {\text{E}} = - \frac{{\text{k}}}{2}\frac{{{\text{z}}{{\text{e}}^2}}}{{\text{r}}}\)

\(\mathrm{K.E}=\frac{\mathrm{k}}{2} \frac{\mathrm{ze}^{2}}{\mathrm{r}} .\) Here \(r\) decreases

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