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because it get very hot from resistive heating, is the simplest explantion. In a bit more detail, an incandescent object emits electromagnetic radiation in a band of frequencies determined by Planck's law. The filament is hot enough for the radiation to be in the visible band. for more info: http://en.wikipedia.org/wiki/Incandescent_light_bulb http://en.wikipedia.org/wiki/Incandescence http://en.wikipedia.org/wiki/Planck%27s_law

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17y ago

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