If an electron in a hydrogen atom jumps from the
3rd orbit to the 2nd orbit, it emits a photon of
wavelength ``\lambda``. When it jumps from the 4th orbit to
the 3rd orbit, the corresponding wavelength of the
photon will be :-
(1)20/7 ``\lambda``
(2)20/13 ``\lambda``
(3)16/25 ``\lambda``
(4)9/16 ``\lambda``