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Incandescence
An incandescent light source is one in which heat is used
to excite atoms and raise electrons energy level so that it can move to higher
orbital level. As electrons release this energy, it emits photons. Candle
light is incandescent and results from excited atoms of soot in the hot flame.
Incandescent light bulbs are the first kind of lights ever and were invented by
Thomas Edison. They are called incandescent because they use heat to make light.
They work by using electricity run though a filament to make light. Light is
emitted when the energy level of an electron is raised and then lowered the
energy that the electron lost is emitted in the form of wave in the
electromagnetic spectrum. In the case of an incandescent light the electricity
is what raises the energy level of an electron. Some of the energy is emitted as
heat and some as light. They use tungsten in light bulbs because it mostly emits
light and not so much heat and other forms of energy.
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