# Heat Transfer Questions

Q.  Depending on the radiating properties, a body will be opaque when _________________?

a. p = 0, x = 0 and a = 1
b. p=l,x = 0anda = 0
c. p = 0, x = 1 and a = 0
d. x – 0, a + p = 1
e. a=0,x + p= 1.

ANSWER: See Answer

where a = absorptivity, p = reflectivity, X = transmissivity
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