If the laser is pointed toward a pinhole with a diameter of 1.0 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 = 1j/s )? An argon ion laser puts out 4.4 W of continuous power at a wavelength of 532 nm. The diameter of the laser beam is 6.0 mm.
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