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Total emissivity of polished silver compared to black body is

This question belongs to Mechanical Engineering Heat And Mass Transfer
Heat and Mass Transfer
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Total emissivity of polished silver compared to black body is

Answer & Solution
Correct Answer: Option D
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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