A heliumneon laser emits red light at wavelength l 633 nm in a beam of diameter 3.5 mm
Chapter 38, Problem 4(choose chapter or problem)
A heliumneon laser emits red light at wavelength l 633 nm in a beam of diameter 3.5 mm and at an energy-emission rate of 5.0 mW. A detector in the beams path totally absorbs the beam. At what rate per unit area does the detector absorb photons?
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