A laser emits light at wavelength 637 nm in a beam of


A laser emits light at wavelength ? = 637 nm in a beam of diameter 2.9 mm and at an energy-emission rate of 5.4 mW. A detector in the beam's path absorbs the beam. At what rate per unit area does the detector absorb photons?

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Physics: A laser emits light at wavelength 637 nm in a beam of
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