Explain how many photons strike the cd surface

Reference no: EM13181400

The watt (W) is the SI derived (or compound) unit of power. Power measures energy per unit 1 W = 1 J/s. A semiconductor laser is a CD player has an output wavelength of 780 nm and a power level of 0.01 mW. How many photons strike the CD surface during the playing of a CD 69 minutes in length?

Reference no: EM13181400

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