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## Homework Statement

You are lost in a forest. You have become separated from your friend. At your eye level, only tree

trunks block your view of distant parts of the forest (there are no leaves and branches at eye level to

block your view, only tree trunks). The trees are spread randomly throughout the forest, but with a

typical spacing of about 3 m, and the tree trunks have typical diameters of 20 cm. You can hear your

friend calling, but you can't see her. Approximately how close do you need to get to each other before

you will see your friend?

## Homework Equations

Mean free path=1/n*sigma=1/n*pi*r^2

Optical Depth T=x/1/n*sigma=n*x*sigma

I/Io=e^-nxsigma

## The Attempt at a Solution

Not really sure where to go with this to be honest.... I dont see how I have enough information/what assumptions to make

Obviously we can solve for Sigma since we have the diamter, but then we dont know how big the forest area/volume is so we cant find n (make an assumption?)

Thanks for any help