Answer: Only a fraction of the electrical energy supplied
Chapter 7, Problem 7.157(choose chapter or problem)
Only a fraction of the electrical energy supplied to an incandescent-tungsten lightbulb is converted to visible light. The rest of the energy shows up as infrared radiation (that is, heat). A 60-W lightbulb converts about 15.0 percent of the energy supplied to it into visible light. Roughly how many photons are emitted by the lightbulb per second? (1 W 5 1 J/s.)
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