Friday

August 29, 2014

August 29, 2014

Posted by **sweety** on Wednesday, April 1, 2009 at 8:18pm.

- thermal physics -
**Count Iblis**, Wednesday, April 1, 2009 at 8:31pmThe area of the sphere is:

A = 4 pi R^2

where R is the radius

The emitted power is given by:

P_em = emissivity*A*sigma T1^4

where T1 is the absolute temperature of the sphere

The absorbed power is given by:

P_ab = emissivity*A*sigma T2^4

where T2 is the absolute temperature of the environment.

sigma is given by:

sigma = 2 pi^5 k^4/(15 h^3 c^2)

Here k is Boltzmann's constant, h is Planck's constant and c is the speed of light. sigma is approximately given by:

sigma = 5.67*10^(-8) Watt/(K^4 m^2)

**Related Questions**

physics - A sphere of radius 0.715 m, temperature 21.1°C, and emissivity 0.672 ...

physics - A .095kg aluminum sphere is dropped rom the roof of a 45m building.If ...

physics - A solid aluminum sphere has a radius of 2.28 m and a temperature of 89...

physics - A solid aluminum sphere has a radius of 2.28 m and a temperature of 89...

PHYSICS - A 494 kg uniform solid sphere has a radius of 0.390 m. Find the ...

physics - A volume of gas v at temperature T1 and pressure P, is enclosed in a ...

physics - A volume of gas v at temperature T1 and pressure P, is enclosed in a ...

physics - A volume of gas v at temperature T1 and pressure P, is enclosed in a ...

physics - A volume of gas v at temperature T1 and pressure P, is enclosed in a ...

college physics - Two solid spheres A and B are made from the same material. The...