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The relation between emissivity $e$ and absorptive power $a$ for a black body is:

If $25\%$ of the total incident radiation $Q = 500 \, J$ is absorbed and $105 \, cal$ is transmitted,calculate the percentage of reflected power.

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Which of the following statements is true for a perfectly black body?

Which of the following statements is wrong?

Distribution of energy in the spectrum of a black body can be correctly represented by

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