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If the velocity of an electron in its fi...

If the velocity of an electron in its first orbit of hydrogen atom is `2.1 xx10^(6)` m/s, then its velocity in the third orbit is

A

`7xx10^(6) m//s`

B

`7xx10^(5) m//s`

C

`7xx10^(4) m//s`

D

`2xx10^(4) m//s`

Text Solution

Verified by Experts

The correct Answer is:
B
`v_(n) =v_(1)/n`
`:. v_(3)=v_(1)/3`
`=(2.1 xx10^(6))/3 =0.7 xx10^(6) m//s`
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