Q. Depending on the radiating properties, a body will be black when
A. p = 0, x = 0 and a = 1
B. p= l,T = 0anda = 0
C. p = 0, x = 1 and a = 0
D. x = 0, a + p = 0
Answer: p = 0, x = 0 and a = 1
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