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Question

In a hydrogen atom, if energy of an electron in the ground state is 13.6 eV, then that in the 2nd excited state is:

A
1.51 eV
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B
3.4 eV
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C
6.04 eV
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D
13..6 eV
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Solution

The correct option is A 1.51 eV
2nd exited state means 3rd energy level or n= 3

E=13.6z2/n2

So Energy is inversly varies to n2

For H atom, Z is 1

So, E3=13.632eV

E3=13.69eV
=1.51 eV

Thus, the correct option is A

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