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The quantity or effectiveness of the energy emitted known as ____________

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The quantity or effectiveness of the energy emitted known as ____________

(a) Refraction

(b) Reflectivity

(c) Emissivity

(d) Luminance

I had been asked this question in homework.

Question is taken from Miscellaneous Properties topic in division Properties of Engineering Materials of Engineering Material & Metallurgy

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Correct answer is (c) Emissivity

The best explanation: Emissivity is defined as the effectiveness of emitting energy and thermal radiation. It is often also known as absorptivity. Luminance is the measure of luminous intensity. Refraction and reflection are the properties by which light changes direction, and change in a direction respectively.

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