1. Feb 4, 2013

AbsoluteZer0

Hi,

I recently came across this formula:

$T = \frac{\hbar c^3}{8 \pi GK_BM}$

As I understand it deals with the radiation that is believed to be emitted by a black hole.
Does it describe the temperature of the radiation?

Thanks

2. Feb 4, 2013

Simon Bridge

It describes the statistics of the radiation coming from close to the event horizon of a black-hole due to the large gravity gradient there.
"Temperature" is a common way of describing such statistics - the model says that the radiation coming from the black hole follows a blackbody spectrum with a characteristic temperature given by that equation.

3. Feb 4, 2013

AbsoluteZer0

Thanks.

One more question I have regarding this equation is: how can we quantify the mass of a black hole (M)? Is it the mass of the singularity?

Last edited: Feb 4, 2013
4. Feb 4, 2013

Simon Bridge

No worries.

In relativity or QM it helps to be carefully pedantic about what things are saying - and that goes squared for when when both of them are used together :)