Recent content by Mimi

oh..I see. Thank you so much tnho!

Nc=2[(2pi*m*KT)/h^2]^(3/2). (m=m*, effective mass for n) ni^2=NcNv*e^-(Ec-Ev)/KT. These are the only values I know...

Homework Statement Given "n=Nc*e-(Ec-Ef)/KT", prove "n=ni*e(Ef-Efi)/KT" Homework Equations Quasi-Fermi Energies..? Ef is Fermi level (extrinsic) and Efi is Fermi level (intrinsic). Ec is Fermi level (conduction). The Attempt at a Solution Very honestly, I cannot figure out how to...

infinitely many "subspaces" in R3 ? In R3, there are zero, 1, 2, 3 dimensional subspaces. But how can I express them with 'specific' example, using variables x,y,and z?

Thank you for lots of help. I think I can get the empirical formula from data if I do the 'reverse' of v. Thank You!

Thank you again! My graph with semi-log is a very very slow curve, but it seems to be fairly close to a straight line. I got an equation of a line for the r(m) vs. V(v); r = 0.0052V + 0.0272, so it is also V=1/0.0052r -0.0272. I am not sure if this is the "empirical" equation, and I don't know...

Thank you..I see... so, is the equation V(r)= ln(r/a) a theoretical one!? Mmm...I am trying to construct a plot of radius vs. V using a semi-log paper, with Yaxis for the value of r (log). But my data(from actual experiment) for the V and r vary "constantly", like, when r=2cm (from the axis)...

I found that change in potential is KQ/r, but I don't know if this is a theoretical equation for V(r).

I have given a cylindrical capacitor with an inner plate(radius=a) and variable radius r. I want to derive an expression, using Gauss's law, for the potential difference V between the inner plate and a point between the plates(radius=r) for the cylindrical capacitor as a function of the inner...

So...should I break A, V0, and R0 into their components form (like A=2i-4j-3k) and plug them into the kinematics equations?

3Dvectors !? Given; A=<3,-2,-4>m/s^2 , V0=<1,2,3>m/s, R0=<30,-80,40>m, T=8s. Find; r0, V, Vave...? Is this 3D vector question? What formulas should I use for finding these values?? Please help...