A substance that radiates light when heated to a high temperature is said to be

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Luminescent

Incandescent

Fluorescent

Phosphorescent

answer is B.

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Detailed Solution

A substance that radiates light when heated to a high temperature is said to be Incandescent.
The principle of incandescence, which is a broad term for light produced by heat, governs how an incandescent bulb functions. An electric current is used to heat a thin metal filament inside an incandescent bulb, causing the filament to glow and emit light. Incandescence is the emission of light by a substance that has been heated till it glows or emits light. For instance, when an iron bar is heated to a very high degree, it initially glows red, but as its temperature increases, it shines white.

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