The watt is the derived SI unit of power, the measure of energy per unit time: 1W

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The watt is the derived SI unit of power, the measure of energy per unit time: 1W = 1J-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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Chemistry The Central Science

ISBN: 978-0321696724

12th edition

Authors: Theodore Brown, Eugene LeMay, Bruce Bursten, Catherine Murphy, Patrick Woodward

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