First slide

Radiation

Question

A black body at 227°C radiate heat at the rate of 7 cal/cm²s. At a temperature 727°C, the rate of heat radiated in the same unit will be :

Moderate

A

80
B

60
C

50
D

112

Solution

$E \infty T^{4} \Rightarrow \frac{7}{E_{2}} = {(\frac{500}{1000})}^{4} \Rightarrow E_{2} = 7 \times 16 = 112 .$

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