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An argon ion laser puts out 5.0 W of continuous power at awavelength of 532 nm. The diameter fo the laser beam is 5.5 mm. If the laser is pointed toward a pinhole with a diameter of 1.2 mm,how many photons will travel through the pinhole per second? Assumethat the light intensity is equally distributed throughout the entire cross-sectional area of the beam.( 1 W= 1 J/s)

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