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Binding Energy

If the bindin...

Question

If the binding energy of the electron in a hydrogen atom is $13.6 e V$ , the energy required to remove the electron from the first excited state of ${L i}^{2 +}$ is:

A

30.6 e V

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B

13.6 e V

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C

3.4 e V

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D

122.4 e V

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Solution

The correct option is A $30.6 e V$
$E$ of ${L i}^{+ +}$ at $n = 2 = \frac{(13.6) 3^{2}}{2^{2}} = 30.6 e V$

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