# An argon ion laser puts out 6.0 W of continuous power at a wavelength of 532 nm. The diameter of the laser beam is 5.0 mm . 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 = 1 J/s)

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An argon ion laser puts out 6.0 W of continuous power at a wavelength of 532 nm. The diameter of the laser beam is 5.0 mm . 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 = 1 J/s)

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Step 1

Energy of the photons with wavelength = 532 nm is given as:

Step 2

Number of photons in the laser beam of 6 W is:

Step 3

The ratio of the pinhole area to...

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