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Monochromatic light of wavelength 632.8 ...

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42mW.
what should be the velocity of a hydrogen atom in order to have the same momentum of photon?

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Mass of hydrogen atom = mass of proton `= 1.67 xx 10^(-27)kg`
`:.` Velocity of hydrogen atom
`= ("momentum of photon")/("mass of hydrogen") = (1.05 xx 10^(-27))/(1.67 xx 10^(-27))`
`= 0.63 m.s^(-1)`
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