Find the pressure exerted on a surface by the photon beam of Problem 42.7 if the cross-sectional

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Find the pressure exerted on a surface by the photon beam of Problem 42.7 if the cross-sectional area of the beam is 3.0 mm2. Assume perfect reflection at normal incidence.


Problem 42.7

A beam (λ = 633 nm) from a typical laser designed for student use has an intensity of 3.0 mW. How many photons pass a given point in the beam each second?

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