Class 11Physics2 Thermal Properties of Matter: Heat TransferRadiation (General, Kirchoff's law, Black body, Prevost's Theory)
Medium$A$ body is said to be opaque to the radiation if ($a$,$r$,and $t$ are the coefficients of absorption,reflection,and transmission,respectively).
- A$t=0$ and $a+r=1$
- B$a=r=t$
- C$t \neq 0$
- D$a=0, r=1, t=1$
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