First slide

Radiation

Question

A ball of surface temperature T is in thermal equilibrium with its environment . Which of the curve gives the energy E radiated by the sphere as a function of time 't'?

Moderate

A

1
B

2
C

3
D

4

Solution

Temperature of body does not change. Hence energy radiated remains same.
As energy emitted remains constant the graph plotted would be a straight line parallel to time axis.

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