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Q.

In the nth orbit, the energy of an electron EN=−13.6n2eV for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be

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a

10.2eV

b

12.1eV

c

13.6eV

d

3.4eV

answer is A.

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Detailed Solution

E1→2=−3.4−(13.6)=+10.2eV
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In the nth orbit, the energy of an electron EN=−13.6n2eV for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be