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For a perfectly black body,the coefficient of emission (emissivity) is:

In which process is the rate of transfer of heat maximum?

The temperature of a blackbody radiation enclosed in a container of volume $V$ is increased from $100^{\circ} C$ to $1000^{\circ} C$. The heat required in the process is

Shown below are the black body radiation curves at temperatures $T_1$ and $T_2$ $(T_2 > T_1)$. Which of the following plots is correct?

If a vessel with black spots is heated to a very high temperature and then taken into a dark room,then:

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