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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)`.
A. 10 ms
B. `2 xx 10 ms`
C. `4 ms`
D. `8 xx 10 ms`

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