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## Homework Statement

The atmosphere of a star has a mean radiation pressure of 0.33 N m

^{-2}and a mean gas pressure of 8300 N m

^{-2}. Calculate:

a) the mean number density of particles in the stellar atmosphere, and

b) the radiation pressure in a stellar atmosphere with twice the eﬀective temperature.

## Homework Equations

[itex] Radiation pressure = \frac{4 \sigma T^{4}}{3c} [/itex] where σ = 5.67*10

^{-8}

## The Attempt at a Solution

a) From the radiation pressure equation, I get T=6016K

and I'm not sure where to go from here. I would have thought to have used pV=nRT, but then that bring volume into the equation. I know it's probably really simple and is just something I am forgetting, but I just can't figure it out :/

b) Multiply the given value (0.33) by 16, as it is T

^{4}

5.28Pa

Thanks