Question:-
A spherical aluminium shell of inside diameter 2m is evacuated and used as radiation test chamber. If the inner surface is coated with carbon black and maintained at 600 K, the irradiation on a small test surface placed inside the chamber is (Stefan-Boltzmann constant s = 5.67 x 10-8 W/m2K4)
Option (A)
1000 W/m2
Option (B)
3400 W/m2
Option(C)
5680 W/m2
Option(D)
7348 W/m2
Correct Option:
(D)
Question Solution:

q = sT41
q = 5.67 x 10-8 x 6004 = 7348.2 W/m2
question-answer-faq-6066