The watt is the derived SI unit of power,the measure of energy per unit time: . A
Chapter 16, Problem 6.80(choose chapter or problem)
The watt is the derived SI unit of power,the measure of energy per unit time: . A semiconductor laser in a CD player has an output wavelength of 780 nm and a power level of 0.10 mW. How many photons strike the CD surface during the playing of a CD 69 minutes in length?
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