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Gamma Decay

The electron ...

Question

The electron in a hydrogen atom at rest makes a transition from $n = 2$ energy state to the $n = 1$ ground state. Find the energy $(e V)$ of the emitted photon.

A

5.8 e V

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B

8.3 e V

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C

10.2 e V

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D

12.7 e V

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Solution

The correct option is C $10.2 e V$
$E = 13.6 (1 - \frac{1}{2^{2}}) = 10.2 e V$

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