12)A black body is heated from 27°C to 127° C. The ratio of their energies of radiations emitted will be a)3:4

c)27:64

b)9:16

d)81:256​

.

Explanation:

Let denote the absolute temperature of this object.

Calculate the value of before and after heating:

.

.

By the Stefan-Boltzmann Law, the energy that this object emits (over all frequencies) would be proportional to .

Ratio between the absolute temperature of this object before and after heating:

.

Therefore, by the Stefan-Boltzmann Law, the ratio between the energy that this object emits before and after heating would be:

.

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