Depending on the radiating properties, a body will be opaque when _________________? October 23, 2020 by Admin A. p = 0, x = 0 and a = 1 B. p=l,x = 0anda = 0 C. p = 0, x = 1 and a = 0D. x – 0, a + p = 1 E. a=0,x + p= 1.