Word: filaments
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...light from a very hot filament is colored yellow or white. The light from a filament which is not very hot is colored...
...Both the color and the amount of light depend on the (temperature) of the emitting filament...
...Emit" means "send out." The amount of light sent out, or "emitted," by a filament depends on how (hot) the filament...
...higher the temperature of the filament the (brighter, stronger) the light emitted...
...flashlight battery is weak, the (filament) in the bulb may still glow, but with only a dull red color...