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Question
a) how many photons per second, on the average, arrive at a target irradiated by this beam? b) 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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Q1
Monochromatic
light of wavelength 632.8 nm is produced by a
helium-neon laser. The power emitted is 9.42 mW.
(a) Find the
energy and momentum of each photon in the light beam,
(b) How many
photons per second, on the average, arrive at a target irradiated by
this beam? (Assume the beam to have uniform cross-section which is
less than the target area), and
(c) How fast
does a hydrogen atom have to travel in order to have the same
momentum as that of the photon?