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Mechanical Engineering · Q128

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 128

Q128

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

Answer: Option D

Solution

Answer: Option D
Solution:
The correct answer is Option D: T 4

Explanation: 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.
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