Looking at the question more closely, I noticed it asks for the Fermi energy "with respect to the middle of the bandgap (Eg/2)." Does this mean that I can just ignore the Ev + (1/2)Eg - (3/4)kT part of the equation? I think this is the solution.
Homework Statement
Using the values of the density of states effective masses me* and mh* in table 5.1, find the position of the Fermi energy in intrinsic Si, Ge, and GaAs with respect to the middle of the bandgap (Eg/2).
Table 5.1 shows the following density of states effective masses me*/me...
Ok I see what I said previously was incorrect! Because
(A-B)2 = (A-B)(A-B) = A2 - 2AB + (-B)2 = A2 - 2AB + B2
NOT what I had earlier. I guess I just need to re-take basic algebra! Thanks Mark!
Hmm I may be wrong, but I think you meant to type "(A -B)2 ≠ A2+A2" (with a + in the second half of the equation) This is the form I gave it in, unless I'm missing something. Is this not correct? I'm getting this from:
(A-B)2 = (A-B)(A-B) = A2 + AB - AB + (-B)2 = A2 + B2
Homework Statement
Does [sin(θ/2)-cos(θ/2)]^2 equal 1 for all values of θ?
I need to figure this out to solve a physics problem.
Homework Equations
sin^2(A)+cos^2(A)=1
The Attempt at a Solution
[sin(θ/2)-cos(θ/2)]^2
=sin^2(θ/2)+cos^2(θ/2)
=1
But this isn't what I get when I put...
Homework Statement
What is the probability that an electron emerging from the plus channel of the first device will end up in the minus channel of the second device? Express your answer in terms of θ. (Refer to the attached image)
Homework Equations
This uses the outcome probability rule that...
Homework Statement
So, I was sitting in my algebra based college physics class and we were talking about buoyancy. According to Archimedes' Principal, "an object that is completely or partially submerged in a fluid experiences and upward force equal to the weight of the fluid displaced."...
Ok I think I got it now. I just set up equations for both of the pulleys and substituted the T2 from the second equation for the 2T1 in the first equation. That way I could solve for T1, which also equals the force required for equilibrium.
Am I on track here?
I'm just a bit lost on the setting up the equations. I know, for example, that if you just had 1 stationary pulley attached to the ceiling, you are just changing the direction of the force, so the ideal mechanical advantage is 1, giving the equation:
Ideal Mechanical Advantage = Force out /...
Yes, but wouldn't the tension be equally distributed among the 3 lengths of cable supporting the weight bearing pulley? That would give it an ideal mechanical advantage of 3, would it not?
Or are you saying that for mechanical advantage, I only have to take the tension of the two lengths of...
Homework Statement
"What are the input forces needed to lift the 200 N load for the arrangement shown?"
Notice how there are two movable pulleys that move in opposite directions as the weight is lifted. That is the confusing part to me.
Homework Equations
Ma=Fo/Fi
The Attempt at...