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Mechanical Engineering · Q86

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 86

Q86

40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is

A.
0.45
Answer
B.
0.55
C.
0.40
D.
0.75

Answer: Option A

Solution

Answer: Option A
Solution:
a + p + T = 1
a + 0.40 + 0.15 = 1 (p = 0.40, T = 0.15)
a = 1 - 0.55
a = 0.45
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