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In hydrogen atom, electron makes transit...

In hydrogen atom, electron makes transition from `n = 4` to `n = 1` level. Recoil momentum of the `H` atom will be

A

`13.6xx10^(-19) kg ms^(-1)`

B

`6.8xx10^(-27) kg ms^(-1)`

C

`12.75xx10^(-24) kg ms^(-1)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaE_((4-1))=(13.6-(13.6)/(16))eV=12.75 eV`
Momentum of hydrogen atom = Momentum of photon
`" " =(E)/(c)=(12.75xx1.6xx10^(-19))/(3.0xx10^(8))=6.8xx100^(-27) kg ms^(-1)`
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