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An electron moves arounf protons (nucleu...

An electron moves arounf protons (nucleus) in a circle of radius 'r'. Assuming that the uncertainty of momentum of electron is of the same order as the momentum itself, the momentum of electron will be :

A

`(h)/(4pi r)`

B

`(h)/(2pi r)`

C

`4pi hr`

D

`2pi hr`

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The correct Answer is:
A
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