AP EAMCET202018 Sep 2020Morning ShiftPhysicsThermal Properties of MatterActual
For a perfect black body, the absorption coefficient is
Options
- A(a=1 )
- B(a < 1 )
- C(a>1 )
- D(a=0 )
Correct answer
A. (a=1 )
Step-by-step solution
A perfectly black body absorbs (100 % ) of radiation incident on it, hence absorption coefficient ( (a_r ) ) is given as ( aligned a_r & = amount of absorb radiation (Q_a ) amount of incident radiation (Q_i ) & = Q_a Q_i = Q_a Q_a [ Q_a=Q_i ] & =1 aligned )