A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be :

Question

Dr. Abubacker · Accepted Answer

[Solution] $P \propto r^2T^4$: factor $(1/4)(16) = 4$, so P = 1800 W. Answer (4).

Q. A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled, the power radiated in watt would be :

Explanation

Reviewed by Dr. Abubacker

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