Q.

A spherical body of emissivity e = 0.6 and area A and placed  inside a perfectly black body is maintained at temperature T, then energy radiated per second will be:

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a

E=0.4 σAT4

b

E=0.8 σAT4

c

E=0.6 σAT4

d

E=1.0 σAT4

answer is C.

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Detailed Solution

E = eσ A t T4   =0.6σAT4
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