Question

A spherical body of area A and emissivity `e=0.6` is kept inside a perfectly black body. Total heat radiated by the body at temperature T
A. `0.4AT^4`
B. `0.8AT^4`
C. `6.0AT^4`
D. `1.0AT^4`

Answer 1

Correct Answer - None of these
(d) In this equation the given option are wrong as all the fout options contain e in place of sigma.
When a spherical body is kept inside a perfectely block
body then the total heat radiated by the body is equal
to that the black body.