The watt is the derived si unit of power the measure of, Chemistry

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The watt is the derived si unit of power the measure of

The watt is the derived SI unit of power the measure of energy per unit time: 1W =1 J-s. A semiconductor laser in a CD player has an output wavelength of 780nm and a power level of 0.10mW. How many photons strike the CD surface during the player of a CD 69 minutes in length?

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