Recent content by Unskilled

Homework Statement 1. Calculate Vcc and Vee(should be around 14-16). 2. Calculate the input resistance. (You should get a high value). 3. Determine the voltage gain. No calculation is needed. http://img210.imageshack.us/my.php?image=effectampqe2.jpg Ucesat = 1 V Poutmax = 10 W Rl...

Which groups in the periodic system forms compounded semiconductors? Is it those who can share 8 valenceelectron together? or is it those who can share 4 valence electrons together? If this is the case why is it just those who can form compound semiconductors? Can i use the...

Homework Statement I need some help :cry: http://www.fysik.uu.se/kurser/1tt306/filer/TentKF06+short-answers.pdf On task 4 a) i don't understand why they have two solutions, one for odd n and the other for even n.

Thanks for the help, for this problem i think i understand how it works. But in generall I'm very confused. The course i have is quantum physics, and my book doesn't say anything about Aufbau principle and hund's rule. We are just studing the Schrödinger equation and from that learning about...

I need help with this problem :) Problem: Give the quantum numbers (n, l, ml, ms) for each electron in one neutral carbonatom in ground state. My solution: I look at a table to get the electron configuration and for a carbonatom i get 1S^2 2s^2 2p^2 For s n=1, l=0, ml=0, ms=+-1/2...

thx for the fast answer :), but i don't really understand. I'm using the energy method but i don't know if it is right to use it because everything gets very complicated and strange, and i think also that i must show that u(x,0)=0 and ||u||=k||f|| somehow? or don't i need to do this, the...

The laplace equation whit initial conditions u_tt + u_xx = 0 -oo<x<oo , t>0 u(x,0)=0 u_t(x,0)=f_k(x) where f_k(x)=sin(kx), has the unique solution u(x,t)=(1/k)sin(kx)sin(kt) Show that the problem is ill posed. I know that the equations is elliptic so i tried first whit the...

Thx, i understand a bit now :D:D I have a question, you said that if i had Auxx-Buyy=something i would have a hyperbolic, is it also true for -Auxx-Buyy=something? And for parabolic must i be Auxx-Buy=something or can it also be Auyy-Bux=something? Thx for the help! :)

1. Of what type is Poisson’s equation uxx + uyy = f(x,y) ? I used that if you have auxx+buxy+cuyy+dux+euy +fu+g=0 where a, b, c, d, e, f, g is constants, and if b^2-4ac<0 then you get an elliptic type because b=0, a=1, c=1 gives 0^2-4*1*1=-4<0 => elliptic Is this right? And why...

could anyone tell me if this have a limit: lim ((exp(x)-1-x)^2)/(x^2 - ln(x^2+1))) x->0 My conclusion is that this doesn't have a limit. Tried everything, this is an problem that i run into.