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September 20, 2014

Homework Help: Physics

Posted by Vanda on Friday, March 18, 2011 at 4:17pm.

A special kind of light bulb emits monochromatic light of wavelength 630 nm. Electrical energy supplied to it at the rate of 60W, and the bulb is 93% efficient at converting that energy into light energy. How many photons are emitted by the bulb during its life time of 730h?

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