First slide

Bohr's atom model

Question

If the radius of an orbit is r and the velocity of electron in it is v, then the frequency of electron in the orbit will be

Easy

A

$2 π r v$
B

$\frac{2 π}{v r}$
C

$\frac{v r}{2 π}$
D

$\frac{v}{2 π r}$

Solution

$T = \frac{2 π r}{v} \Rightarrow \frac{1}{f} = \frac{2 π r}{v} \Rightarrow f = \frac{v}{2 π r}$

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