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If the average life time of an excited s...

If the average life time of an excited state of hydrogen is of the order of `10^(-6)` s estimate how may orbits an electron makes, whenit is the state n=2 and before it suffers a transition to state n=1 (Bohr radius `r_(0) = 5.3 xx 10^(11)`m)

A

`3.21 xx 10^(8)`

B

`5.46 xx 10^(8)`

C

`8.22 xx 10^(8)`

D

`8.52 xx 10^(9)`

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The correct Answer is:
C
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