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Mechanical Engineering · Q29

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 29

Q29

Total emissivity of polished silver compared to black body is

A.
Same
B.
Higher
C.
More or less same
D.
Very much lower
Answer

Answer: Option D

Solution

Answer: Option D
Solution:
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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