Which of the following orbit is impossible for an electron according to Bohr's theory?

m v r = \frac{n h}{2 π}

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m v r = \frac{h}{π}

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m v r = \frac{2 h}{π}

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m v r = \frac{4 h}{2 π}

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Solution

The correct option is A $m v r = \frac{n h}{2 π}$
All of the given orbits are possible for an electron according to Bohr's theory. The electron revolves only in the orbits in which $m v r = \frac{n h}{2 π}$ .
The angular momentum $(m v r)$ is an integral multiple of $\frac{h}{2 π}$
This refers to quantisation of orbital angular momentum.

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