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A hydrogen atom emits a photon correspon...

A hydrogen atom emits a photon corresponding to an electron transition from `n = 5` to `n = 1`. The recoil speed of hydrogen atom is almost (mass of proton `~~1.6 xx 10^(-27) kg)`.

A

`10^(-4)m//s`

B

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

C

`4m//s`

D

`8xx10^(-2)m//s`

Text Solution

Verified by Experts

The correct Answer is:
C
`v=(h)/(m lambda) , (1)/(lambda) = R [1-(1)/(25)]` .
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