An argon ion laser puts out 5.0 W of continuous power at a wavelength of 532 nm. The
Chapter 7, Problem 75(choose chapter or problem)
An argon ion laser puts out 5.0 W of continuous power at a wavelength of 532 nm. The diameter of 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? Assume that the light intensity is equally distributed throughout the entire cross-sectional area of the beam. ( 1 W = 1 J>s )
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