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Mechanical Engineering · Q30

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 30

Q30

Depending on the radiating properties, a body will be black when (Where a = absorptivity, p = reflectivity, x = transmissivity.)

A.
p = 0, x = 0 and a = 1
Answer
B.
p = 1, T = 0 and a = 0
C.
p = 0, x = 1 and a = 0
D.
x = 0, a + p = 0

Answer: Option A

Solution

Answer: Option A
Solution:
Depending on the radiating properties, a body will be black when, p = 0, x = 0 and a = 1
(Where a = absorptivity, p = reflectivity, x = transmissivity)
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