- #1
cragar
- 2,552
- 3
Homework Statement
use E_m=1/n (E)p(E)dE integral from 0 to Infinity
to derive E_m=3/5(E_f)
Homework Equations
n= p(E)dE integral from 0 to infinty
also n=Q*sqrt(E)dE integarl from 0 to (E_f)
p(E)=Q*sqrt(E)/(e^(E-E_f)+1)
The Attempt at a Solution
i tried doing integration by parts on it and moving stuff around but i can't seem to get it , is there a trick in using that the integral from o to infinty of p(E)dE = 0