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The recoil speed of a hydrogen atom af...

The recoil speed of a hydrogen atom after it emits a photon is going form n=5 state to n =1 state is ….. m/s.

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The correct Answer is:
4
`6 (1 - (1)/(25)) eV = 13.0 eV`
`E//c = mv ("inomomentum conserved")`
`v = (E)/(mc) = E_(photon) = (13.13 (1.6 xx 10^(-19)))/((1.67) (10^(-27)) (3) (10^(8))) = 4 m//s`
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