A sphere of radius 10 cm is hung inside an oven whose walls are at a temperature of 1000 K. Calculate total heat energy incident per second (in joules//sec) on the sphere, sigma=5.67xx10^(-8) mks units.

A sphere of radius 10 cm is hung inside an oven whose walls are at a t

1.	A sphere of radius 10 cm is hung inside an oven whose walls are at a temperature of 1000 K. Calculate total heat energy incident per second (in joules//sec) on the sphere, sigma=5.67xx10^(-8) mks units.
Answer» Solution :Here, `r=10 cm =10^(1) m, T=1000 K`, `SIGMA= 5.67xx10^(-8)` mks units Heat energy incident/sec area`=sigma T^(4)` Total heat energy incident/sec `E=sigma T^(4)` x area of sphere `=sigma T^(4)xx4 pi r^(2)` `=5.67xx10^(-8)xx(10^(3))^(4)xx4xx(22)/(7)(10^(-1))^(2)` `E= 7128 j s^(-1)`