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  • Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. (c) How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?

Q: 11.4 (c) 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 the same momentum as that of the photon?

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Mass of Hydrogen Atom (m)=1.67\times10-27 kg.

The speed at which hydrogen atom must travel to have momentum equal to that of the photons in the beam is v given by

 \\v=\frac{p}{m}\\ v=\frac{1.05\times 10^{-27}}{1.67\times 10^{-27}}\\ v=0.628\ ms^{-1}

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Sayak

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