In a laser range-fi nding experi ment, a pulse of laser
Chapter 28, Problem 63(choose chapter or problem)
In a laser range-fi nding experi ment, a pulse of laser light is fired toward an a1Tay of renecting mirrors left on the moon byApollo astronauts. By measuring the time it takes for the pulseto travel to the moon, renect off the mirrors, and return to earth,scientists can measure the distance to the moon to an accuracyof a few centimeters. The light pulses are 100 ps long, and thelaser wavelength is 532 nm. When the pulse reaches the moon, ithas an intensity of300 W/m2 How many photons strike a single4.0-cm-diameter mirror from one laser pulse?
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