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Which relation expresses Bohr's quantisation of the angular momentum of the electron in a hydrogen atom?

A $m v r = \frac{nh}{2 π}$
B $m v r = \frac{n ^{2} h}{2 π}$
C $m v r = \frac{h}{2 πn}$
D $m v^{2} r = \frac{nh}{2 π}$

Answer: A

Bohr postulated that only orbits whose angular momentum is an integral multiple of

h /2 π

are allowed, i.e.

m v r = nh /2 π

. The other forms have wrong dependence on

n

or wrong dimensions.

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