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Q.

Energy of the electron in nth orbit of hydrogen atom is given by En=-13.6n2eV. The amount of energy needed to transfer electron from first orbit to third orbit is

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a

13.6 eV

b

3.4 eV

c

12.09 eV

d

1.51 eV

answer is C.

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Detailed Solution

For n=1, E1=-13.6(1)2=-13.6 eVand for n = 3,  E3=-13.6(3)2=-1.51 eVSo required energy =E3-E1=-1.51-(-13.6)=12.09 eV
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