How they got formula 1.7 from formula 1.6

[nhrock3]

there is no rho in 1.6
and E disappeared

??

 

[Borek]

I have not the slightest idea what it is all about, but perhaps σρ=1.

 

[nhrock3]

its about solid state physics and semiconductors
and there is no rho in 1.6

 

[waht]

What work have you done so far to find how σ and ρ are related?

You obviously have gaps in the subject and should review EM before continuing on. It's such a simple relationship.

 

[nhrock3]

\sigma =\frac{ne^2\tau }{m}E =\rho J

\tau=\frac{m}{\rho n e^2}

 

[waht]

here is a hint.

What is definition of σ?

What is definition of ρ?


can you find this out please.

 

[nhrock3]

thanks :)