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OpenStudy (anonymous):
A helium-neon laser emits red light at wavelength 633 nm in a beam of diameter 3.5 mm and at an energy emission rate of 5.0 mW. A detector in the beam’s path totally absorbs the beam. At what rate per unit area does the detector absorb photons?
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OpenStudy (anonymous):
i don't know how to use "beam diameter = 3.5 mm", please help
OpenStudy (naveenbabbar):
You can find area of the absorbing surface
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