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## Homework Statement

A cavity contains black body radiation at temperature at T=500K. Consider a optical mode in the cavity with frequency w=2.5x10^(13) Hz. Calculate;

(a)the probability of finding 0 photons in the mode.

(b)the probability of finding 1 photon in the mode

(c)the mean number of photons in the mode.

## Homework Equations

## The Attempt at a Solution

Okay so I'm not sure where to start basically with part (a) and (b), but I made an attempt at part (c)

I used the equation;

[tex]\bar{n}=\frac{1}{e^{\frac{\hbar\omega}{k_b T}}-1}=2.51\times 10^{-17} Photons[/tex]

would really love a nudge in the right way, I've just gone blank on probability it's been so long since I last did it.

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