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A black body at a temperature of 227^(@)...

A black body at a temperature of `227^(@)C` radiates heat energy at the rate of 5 cal/`cm^(2)`-sec. At a temperature of `727^(@)C`, the rate of heat radiated per unit area in cal/`cm^(2)`-sec will be

A

80

B

160

C

250

D

500

Text Solution

Verified by Experts

The correct Answer is:
A
`(E_(2))/(E_(1))=((T_(2))/(T_(1)))^(4)=((273+727)/(273+227))^(4)`
`(E_(2))/(5)=((1000)^(4))/((500)^(4))=16rArrE_(2)=80" cal cm"^(-2)`
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