A black body is at 727°C. It emits energy at a rate, which is

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A black body is at 727°C. It emits energy at a rate, which is proportional to ___________
A. (727)^2
B. (1000)^2
C. (727)^4
D. (1000)^4

Correct choice is D. (1000)^4

To elaborate: Eα(273+727)^4

Eα(1000)^4.