In a laser range-finding experiment, a pulse of laser light is fired toward an array of reflecting mirrors left on the moon by Apollo astronauts. By measuring the time it takes for the pulse to travel to the moon, reflect off the mirrors, and return to earth, scientists can calculate the distance to the moon to within a few centimeters. A single mirror receives 0.38 W of power during a 100-ps-long pulse of 532-nm-wavelength laser light. How many photons are in the pulse?
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