Depending on the radiating properties, a body will be black when

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