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Q.

Frequency of revolution of electron in the n^th Bohr’s orbit is given by

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a

$f = \frac{{me}^{4}}{4 \in_{o}^{2} n^{3} h^{3}}$

b

$f = \frac{{me}^{4}}{4 \in_{o}^{2} h^{2}}$

c

$f = \frac{{me}^{4}}{\in_{o} n}$

d

$f = 4 \in_{o}^{2} n^{3} h^{3}$

answer is A.

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$f = \frac{1}{T}$

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