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The watt is the derived SI unit of power, the measure of energy per unit time:...

The watt is the derived SI unit of power, the measure of energy per unit time: 1 W = 1 J/s. A semiconductor laser in a CD player has an output wavelength of 780 nm and a power level of 0.14 mW. How many photons strike the CD surface during the playing of a CD 64 minutes in length?

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