Total emissivity of polished silver compared to black body is

Total emissivity of polished silver compared to black body is

Right Answer is:

Very much lower

SOLUTION

Emissivity is defined as the ratio of the energy radiated from a material’s surface to that radiated from a perfect emitter, known as a blackbody, at the same temperature and wavelength and under the same viewing conditions.

The total emissivity of polished silver compared to the black body is very much lower.

A polished silver surface has an emissivity of about 0.02 near room temperature. Black soot absorbs thermal radiation very well; it has an emissivity as large as 0.97.

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