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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 9.42 mW.
How fast does a hydrogen atom have to travel in order to have to have the same momentum as that of the photon ?

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Given, `lambda = 632.8 nm = 632.8 xx10^(-9)m, p = 9.42 xx10^(-3)W`
`h=6.63xx10^(-34)J-s, c=3xx10^(8)m//s`
Since, `P_("Hydrogen")=P_("Photon")`
`rArr m upsilon = p rArr upsilon = (p)/(m)=(1.05xx10^(-27))/(1.66xx10^(_27))[because m_(H)=1.66xx10^(-27)kg]' therefore upsilon = 0.63 m//s`.
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