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Mechanical Engineering · Q107

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 107

Q107

Emissivity of a white polished body in comparison to a black body is

A.
Higher
B.
Lower
Answer
C.
Same
D.
Depends upon the shape of body

Answer: Option B

Solution

Answer: Option B
Solution:
White body reflects all incident radiation;
i.e., its absorptivity is zero.
Accordingly, its emissivity is also zero.
So any black or even "grey" body will have a higher emissivity,
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