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Question

The difference between (n+2)th Bohr radius and nth Bohr radius is equal to the (n2)th Bhor radius. The value of n is ?

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Solution

Radius of nth Bohr orbit is given by
rn=(h2ϵoπme2)n2
Hence,
rnn2
Thus we get rn+2=k(n+2)2
and rn=kn2
and rn2=k(n2)2
(n+2)2n2=(n2)2
n=8

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