An electron in hydrogen atom first jumps from second excited state to ground state and then from first excited state to ground state. Let the ratio of wavelength, momentum and energy of photons emitted in these two cases be 
and c respectively, then -
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( b, c, d)
First transition is form 
to 
. Second transition is form 
to 
.
As 
, therefore, 
i.e,. 
As 
ог 
or 
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