If the energy difference between the orbits when an electron in H atom excited to higher energy orbit from its ground state is `12.1eV//` atom , calcualte the frequency of radiation emitted `(1 eV =1.602xx10^(-19J))` when electron comes back to second energy level.

Explanation

(i) relation between energy and n
(ii) calculation of `n_2` value from the difference in energy.
(iii) calculation of frequecny from energy
(iv) calculation of energy difference based on n values
(v) calcualtion of frequency
(vi) `v=0.456xx10^(15)s^(-1)`