A body is placed in an insulating container at temperature `227^(@)C`. In order to keep its temperature `727^(@)C`, power of 60 W is required, the power required to keep its temperature `1227^(@)C` will be :

Options

A. 304
B. 321
C. 90
D. 120

Answer

B

Explanation

Here E = power
`(E_(1))/(E_(2))=(T_(1)^(4)-T_(0)^(4))/(T_(2)^(4)-T_(0)^(4))`
`(60)/(E_(2))=((1000)^(2)-(5000)^(4))/((1500)^(4)-(500)^(4))=(16-1)/(81-1)=(15)/(80)`
or `E_(2)=(60xx80)/(15)=320W`
Correct choice is (b).