Pick out the wrong statement: A)With change in temperature, the radiant energy emitted by a black body remains unchanged B)Absorptivity of a body approaches unity in case of diffuse reflection C)Absorptivity of a perfectly black body is unity D)Value of Stefan-Boltzmann constant is 4.876 × 10^-8 KCal/m² .hr.°K⁴

Question

Quizplus · Accepted Answer

The radiant energy emitted by a black body changes with temperature, following the Stefan-Boltzmann law, which states that the total energy radiated per unit surface area of a black body across all wavelengths per unit time ($j^*$) is directly proportional to the fourth power of the black body's absolute temperature ($T$), represented as $j^* = \sigma T^4$, where $\sigma$ is the Stefan-Boltzmann constant. Therefore, as temperature changes, the radiant energy emitted by a black body also changes.

Pick Out the Wrong Statement