Question

For any material, if $R, \, T$ and $A$ represent the reflection coefficient, transparent coefficient and absorption coefficient respectively, then for a blackbody which one of the following is true

• A. $R=1, \, T=0, \, A=0$
• B. $R=0, \, T=1, \, A=1$
• C. $R=0, \, T=0, \, A=1$
• D. $R=0, \, T=1, \, A=0$

Answer 1

Answer: (C)

$\because $ Relation between $R, \, T$ and $A$ is
$A+T+R=1$ ...(i)
$\because $ For ideal blackbody,
$A=1$
$\therefore $ According Equation (i),
$R=0, \, T=0$ and $A=1$