First slide

Radiation

Question

A spherical body of area A and emissivity e = 0 .6 is placed inside a perfectly black body' The heat radiated by the body at temperature T is

Moderate

A

$0 \cdot 4 σ {AT}^{4}$
B

$0 \cdot 6 {σaT}^{4}$
C

$0 \cdot 8 {σAT}^{4}$
D

$1 \cdot 0 {σAT}^{4}$

Solution

When a non-black body is placed inside a hollow enclosure, the total radiation from the body is sum of what it would emit in the open (with e < 1) and the part of the incident radiation from the walls reflected by it. The two add up to a black body radiation. In this way, the total radiation emitted by the body is $1 \cdot 0 {σAT}^{4}$ .

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