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January 30, 2015

January 30, 2015

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)

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