Question
A black body is at 727o C. It emits energy at a rate which is proportional to:
-
(727)2
-
(1000)4
-
(1000)2
-
(727)2
Solution
B.
(1000)4
Amount of heat energy radiated per secnd by unit area of black body is directly proportional to fourth power of absoulte temperature.
Accordign to steafan's law,
Where σ is constatn of proportionality and called Steafan's constant. Its value is
5.67 x 10-8 Wm-2 K-4.
hence, E = (727+273)4
E = (1000)4
