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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 p

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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)`.
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`E_("photon")=13.6(1-1/25)eV=13.0eV`
` E//c=mv("momentum conserved")`
`E/(mc)=(13xx106xx10^(-19))/(1.67xx10^(-27)xx3xx10^(8))=4m//sec`
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