Drude formula


by aaaa202
Tags: drude, formula
aaaa202
aaaa202 is online now
#1
Feb5-14, 09:30 AM
P: 995
I can't derive it properly even though it should be easy:
From Newtons 2nd law:

m dv/dt = -eE

=>

v(t) = -meEt + v(0) (the latter will average out when taking average)

Now the Drude assumption: An electron will on average travel a time τ before being scattered and starting its motion in the direction of E all over.

Thus this means, I think, that on average an electron will travel with a velocity equal to
<v> = -meEτ/2

And one can then multiply by electron density to get the Drude formula. Problem is the conductivity should not have the factor . Am I not right in thinking that the electron on average will travel at the velocit given above.
Phys.Org News Partner Physics news on Phys.org
Chameleon crystals could enable active camouflage (w/ video)
Atomic switcheroo explains origins of thin-film solar cell mystery
X-ray laser experiment explores how specially shocked material gets stronger

Register to reply

Related Discussions
Drude model Atomic, Solid State, Comp. Physics 3
self-induction and drude equation Classical Physics 6
Drude Model Atomic, Solid State, Comp. Physics 0
Drude model for PEC Atomic, Solid State, Comp. Physics 0
drude model! Atomic, Solid State, Comp. Physics 5