The watt is the derived 51 unit of power, the measure of energy per unit time: 1 W = 1
Chapter 6, Problem 6.79(choose chapter or problem)
The watt is the derived 51 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 0.10 m W. How many photons strike the CD surface during the playing of a CD 69 minutes in length?
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