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Question

The number of revolutions done by an electron ‘e’ in one second in the first orbit of hydrogen atom is

A
6.57×1015
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B
6.57×1013
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C
1000
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D
6.57×1014
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Solution

The correct option is A 6.57×1015
Velocity of electron =2.18×106(zn)
Radius of electron =0.0529×109m
Number of revolution =v2πx rev/sec T=2πnv

=2.18×106×1092π×0.0529rev/sec
=6.558×1015rev/sec
=6.57×1015rev/sec

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