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 mW.
How many photons strike the CD surface during the playing of a CD 69 minutes in length?
The answer to the question is available in the PDF file https://www.assignmentexpert.com/https://www.assignmentexpert.com/homework-answers/chemistry-answer-81942.pdf
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