First slide

Radiation

Question

A black body is at a temperature 300 K. It emits energy at a rate, which is proportional to

Moderate

A

${(300)}^{4}$
B

${(300)}^{3}$
C

300
D

${(300)}^{2}$

Solution

From Stefan's law the total radiant energy (E) emitted per second per unit surface area of a black body is proportional to the fourth power of the absolute temperture (T) of the body
i.e., E = ${σT}^{4}$
where $σ$ is Stefan's constant
Hence, E directly proportional to ${(300)}^{4}$

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