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A black body radiates 20 W at temperatur...

A black body radiates 20 W at temperature `227^(@)C`. If temperature of the black body is changed to `727^(@)C` then its radiating power wil be

A

120 W

B

240 W

C

320 W

D

360 W

Text Solution

Verified by Experts

The correct Answer is:
C
As `Q/t = P= A sigma T^4`
`implies (P_2)/(P_1)=((T_2)/(T_1))^4 implies P_2 =20 ((273+727)/(273+227))^4 implies P_2 = 320` W.
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