A sphere of radius 10 cm is hung inside an oven walls are at a temperature of 1000 K. Calculate total energy incident per second (in `Js^(-1)`) on the sphere. Given `sigma = 5.67 xx 10^(-8) SI` units.

Answer

`[7128 j s^(-1)]`

Explanation

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)`