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12.Atoms
normal
As an electron makes a transition from an excited state to the ground state of a hydrogen - like atom/ion
A
kinetic energy decreases, potential energy increases but total energy remains same
B
kinetic energy and total energy decrease but potential energy increases
C
its kinetic energy increases but potential energy and total energy decrease
D
kinetic energy, potential energy and total energy decrease
Solution
$\mathrm{U}=-\mathrm{K} \frac{\mathrm{ze}^{2}}{\mathrm{r}} ; \mathrm{T} \cdot \mathrm{E}=-\frac{\mathrm{k}}{2} \frac{\mathrm{ze}^{2}}{\mathrm{r}}$
$\mathrm{K} . \mathrm{E}=\frac{\mathrm{k}}{2} \frac{\mathrm{ze}^{2}}{\mathrm{r}} .$ Here $r$ decreases
Standard 12
Physics
