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Q.

A black body of surface area 10 cm2 is heated to 127°C and is suspended in a room at temperature 27°C. The rate of loss of heat is

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a

1 W

b

2 W

c

3 W

d

4 W

answer is A.

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Detailed Solution

Applying Stefan's law, we have dEdt=σAT14−T04=5⋅67×10−8×10×10−4(400)4−(300)4=1 watt.
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A black body of surface area 10 cm2 is heated to 127°C and is suspended in a room at temperature 27°C. The rate of loss of heat is