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Q) the energy of an electron in the 1st Bohr orbit oh H atom is -13.6ev. the possible value of the excited state of electron in bohr orbits of He+ ion is
!) -13.6eV 2)-4.21 ev 3)6.8ev 4)-6.8ev
-13.6
use this formula E=-13.6 Z2(1/n2)
By changing the values of n=1,2,3...
so n2=1,4,9...
as only n=2 will match with the four options
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