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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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Here, `lamda=632.8nm=632.8xx10^(-9)m`,
`P=9.42mW=9.42xx10^(-3)W`
Momentum of a hydrogen atom is equal to the momentum of a photon. Therefore, required speed (v) of the hydrogen atom is
`v=("Momentum of photon ")/(m_(H))=(1.05xx10^(-27))/(1.66xx10^(-27))=0.63ms^(-1)`
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