A special kind of light bulb emits monochromatic light of


A special kind of light bulb emits monochromatic light of wavelength 652 nm. Electrical energy is supplied to it at the rate of 60 W, and the bulb is 87% efficient at converting that energy to light energy. How many photons are emitted by the bulb during its lifetime of 660 h?

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Physics: A special kind of light bulb emits monochromatic light of
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