An electric heater emits 1000 W of thermal radiation. The coil has a surface area of 0.020 m2. Assuming that the coil radiates like a blackbody, find its temperature. σ=6.00×10−8W/m2−K4.
955 K
Let the temperature of the coil be T. The coil will emit radiation at a rate Aσ T4. Thus,
1000W =(0.020 m2)×(6.0×12−8W/m2−K4)×T64
or, T4=10000.020×6.00×10−8K4
=8.33×1011K4
or, T=955 K.