00:01
So for this problem, we are asked to determine the thermal equilibrium electron in whole concentrations for a given dropping concentration.
00:09
Now consider a germanian sample at a temperature that is given and that temperature is equal to 300 kelvin in which nd, the concentration nd, is 5 times 10 to the 13, centimeters, cubic centimeters, well, centimeters to the minus three, and n .a, the concentration n .a is zero.
00:44
So assume an initial concentration, lowercase i, that is equal to 2 .4 times 10 to the 13 centimeters to the minus three.
00:59
So first, what we need to obtain, is the majority carrier electron concentration that we are going to call m -sum -n -sub -0, and that is just simply equal to 1 divided by 2, this times n -d, the concentration n -d, and this plus the square root of n -d to the square, plus four times the initial concentration to the square, and that's it.
02:04
So we just need to simply substitute the values in here.
02:07
So we will have 1 divided by 2, the concentration and d that we are given, that is 5 times 10 to the 13, this plus the square root of that value again, but in this case elevated to the 3...