Lightbulb is visible light and that the average wavelength

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One watt (W) is equal to 1 J/s. Assuming that 5.0% of the energy output of a 75 W lightbulb is visible light and that the average wavelength og the light is 550 nm, how many photons are emitted by the lightbuld each seond?

Reference no: EM13190388

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