First slide
Hydrogen -like ion

Hydrogen atom in ground state is excited by a monochromatic radiation of λ= 975 Aο. Number of spectral lines in the resulting spectrum emitted will be 



 Energy of the photon, E=hcλ

E=6.63×10-34×3×108975×10-10 J


After absorbing a photon of energy 1275 eV, the electron will reach to third excited state of energy-0.85 eV, since energy difference corresponding to n =1 and n = 4 is 12.75 eV. 

 Number of spectral lines emitted


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