A body radiates heat at the rate of 4 cal/m2/s, when its temperature is 227°C. what is the heat radiated by the same body when its temperature is 727°C?
8 cal/m2/s
16 cal/m2/s
64 cal/m2/s
32 cal/m2/s
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The earth receives at its surface radiation from the sun at the rate of 1400 W/$m^{2}$. The distance of the centre of the sun from the surface of the earth is 1.5 × $10^{11}$ m and the radius of the sun is 7.0 × $10^{8}$ m. Treating sun as a black body, it follows from the above data that its surface temperature is,