First slide

Radiation

Question

A spherical body of area A and emissivity e = 0.6 is kept inside a perfectly black body. Energy radiated per second by the body at temperature T is

Easy

A

$0.4 σ A T^{4}$
B

$0.8 σ A T^{4}$
C

$0.6 σ A T^{4}$
D

$1.0 σ A T^{4}$

Solution

Stefan's law heat radiated per sec $e A σ T^{4}$

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