Average speed of effusing molecules

[-Vitaly-]

1. The problem statement, all variables and given/known data
http://img406.imageshack.us/img406/6418/problemo.jpg


2. Relevant equations
<V>=( Integral-from-0-to-inf(V*f(V)*dV) ) / ( Integral-from-0-to-inf (f(V)*dV) )

(second integral is for normalisation)


3. The attempt at a solution
http://img32.imageshack.us/img32/529/thermalphysics.jpg

[-Vitaly-]

I just realised, that average speed is not the most probable speed. I think I need to differentiate the speed distribution functions and find those two speeds.

[-Vitaly-]

Yea, that worked.