Q103 / 120 · VITEEE 2017 · Physics

An electron makes a transition from an excited state to the ground state of a hydrogen - like atom. Then

A
kinetic energy decreases, potential energy increases but total energy remains same
B
kinetic energy and total energy decrease but potential energy increases
Correct answer
C
its kinetic energy increases but potential energy and total energy decrease
D
kinetic energy, potential energy and total energy decrease

Solution

$\begin{aligned} U=-K \frac{z e^{2}}{r} ; T . E=-\frac{k}{2} \frac{z e^{2}}{r} \\ K . E=\frac{k}{2} \frac{z e^{2}}{r} . \text { Here } r \text { decreases } \end{aligned}$

Hence, the correct answer is option: 'C'.

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