Word: lightly
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Dates: during 1950-1959
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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...
...blacksmith or other metal worker sometimes makes sure that a bar of iron is heated to a "cherry red" before hammering it into shape. He uses the (color) of the light emitted by the bar to tell...
...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...