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Question

Energy of electron in first orbit of hydrogen atom is:

A
13.6 eV
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B
27.2 eV
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C
54.4 eV
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D
none of the above
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Solution

The correct option is A 13.6 eV
As for hydrogen atom,

z=1,
n=1.

E=13.6z2n2 eV.

Substituting the value of n,z we get

E=13.6 eV

Hence, the correct option is A

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