Question:
On reducing temperature of surface to one third amount of radiation becomes:-
Answer:
The relationship between temperature and radiation is given by Stefans law. According to this law, the heat energy emitted per second per unit area of a perfectly black body is proportional to T4 where T is measured in Kelvin
E proportional to T4
Hence, if temperature of the surface is reduced to 1/3, then the effect on radiation can be found using the above relation
E ∞ T4
E1 ∞ (T/3)4
∞ T4 / 81
∞ E / 81
Hence, radiation will be 1/81 times the original radiation.
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