According to Stefan's law, the total radiation from a black body per second per unit area is proportional to
A. Absolute temperature
B. T2
C. T5
D. T4
Answer: Option D
Solution (By Examveda Team)
The correct answer is Option D: T 4Explanation: According to Stefan's law, also known as the Stefan-Boltzmann law, the total radiation emitted from a black body per second per unit area is proportional to the fourth power of the absolute temperature (T). Mathematically, this is expressed as E∝T 4, where E is the emissive power and T is the absolute temperature. Therefore, the correct exponent is 4, not any other value.
This Question Belongs to Mechanical Engineering >> Heat And Mass Transfer
Stefan-Boltzmann law, statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature.