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

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