The electron in a H-atom makes a transition n 1 → n 2 , where n 1 and n 2 are the principal quantum numbers of the two energy states. Assume the Bohr's model to be valid. The time period of the electron in initial state is eight times that in the final state. What are the possible values of n 1 and n 2 .
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Sol. The time period 
of an electron in a Bohr orbit of principal quantum number 
is
As 
, the above relation gives
Thus the possible values of 
and 
are
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