Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. Find the energy and momentum of each phot
Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW.
Find the energy and momentum of each photon in the light beam,
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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`
`E = (hc)/(lambda)=(6.63xx10^(-34)xx3xx10^(8))/(632.8xx10^(-9))=3.14xx10^(-19)J`.
Momentum of each photon, `p = (h)/(lambda)=(6.63xx10^(-34))/(632.8xx10^(-9))=1.05xx10^(-27)kg. (m)/(s)`
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