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Average lifetime of a hydrogen atom exci...

Average lifetime of a hydrogen atom excited to `n =2` state is `10^(-6)s` find the number of revolutions made by the electron on the average before it jump to the ground state

A

`4.2 xx 10^(-7)`

B

`2.3 xx 10^(-7)`

C

`1.5 xx 10^(-7)`

D

`1.2 xx 10^(-7)`

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The correct Answer is:
D
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