Thanks for the reply. I mean exactly one ball. You're right, I wasn't clear enough about E_i . I want to adjust P_i so that, if an observer didn't see how the experiment took place, but repeated the experiment a number of times (and tabulated which baskets received a ball), he would conclude...
Homework Statement
I have N balls and B baskets. I look at each basket i in turn and decide with some probability P_i whether to insert one ball. After N balls are inserted, I stop. If I look through all the baskets B , I stop; I do not make a second run-through, even if all the balls haven't...
Okay. So when it oscillates to the horizontal position would we have to conclude that KE at this point is practically 0? Because if the PE is always 0 at all stages then it could not have gained any KE.
Skip to 29:50. Here Feynman is explaining how some laws are not independent of energy conservation. In this case he goes on to explain how instead of using the law of levers were can use energy conservation to see what weight an object needs to on one side be to balance (or be in a state where...
I'm trying to understand mathematically, if possible, why it is that the Earth bulges at the equator as a result of its rotation and how exactly gravity manages to keep it all together. Would the better approach be to keep myself in a rotating frame of reference? I lack some knowledge of...
I find that since graduating a lot of people assume you know everything about everything that uses/involves physics ever, from understanding how a light bulb works to knowing the complete inner workings of hydroelectric dams. Some questions are more convoluted than others, but can anyone here...
Hi, I'm just getting a little confused with all the definitions here and I need some confirmation on what I say is correct or not;
Isospin symmetry: The property that an interaction is independent of the T_3 value?
Isospin breaking: The property that it is dependent on T_3 ?
Charge symmetry...
Lectures in magnetohydrodynamics by D.Schnack. Think it's possible to access it online. Chapter 12 when it talks about magnetic helicity (page 73).
If it's not possible in general to write it like that, it might because it's relevant to the situation.
Maybe the volume element is chosen to be a...
Hi, I have a book that makes the equality.
\vec{B}dV = (\vec{e_1}B_1 + \vec{e_2}B_2 + \vec{e_1}B_2)dx_1 dx_2 dx_3 \\[1ex]
= dx_1 \vec{e}_1(B_1 dx_2 dx_3 ) + dx_2 \vec{e}_2(B_2 dx_1 dx_3 ) + dx_3 \vec{e}_3 (B_3 dx_1 dx_2) = (\vec{B}\cdot d\vec{S}) d\vec{l}.
I'm a bit confused as to how it...
I apologise but I'm still lost. Even with the clean up of definitions I run into the same issue.
Using E_v(k) = -\hbar^2 k^2/2m_v, E_c(k) = E_g + \hbar^2 k^2/2m_c as you said. One then gets E_c(k) - E_v(k) = E_{\gamma} which, for a given E_{\gamma}, E_g , fixes the constant k. This, in turn...
I'm trying to understand the form of the absorption spectrum of a T=0K intrinsic semiconductor. The valence band/conduction band energy diagram looks like;
http://postimg.org/image/wyzvo9lsr/
As E = \frac{\hbar^2 k^2}{2m^*}
where m^* denotes the effective mass. The image doesn't...
Homework Statement
If A and B are invertible matrices over an algebraically closed field k , show there exists \lambda \in k such that det(\lambda A + B) = 0 .The Attempt at a Solution
Can anyone agree with the following short proof? I tried looking online for a confirmation, but I wasn't...
I'm slightly confused as to how we discuss centre of mass frames in nuclear reactions.
We have the reaction a(A,B)b. Before the reaction we can transfer to the centre of mass frame
v_c = \frac{\sum m_i v_i}{\sum m_i}
and note that the total energy before the reaction is
E_{CM} =...
Homework Statement
I have a question asking me to find the expectation value of S_{12} for a system of two nucleons in a state with total spin S = 1 and M_s = +1 , where S_{12} is the tensor operator inside the one-pion exchange nuclear potential operator, equal to
S_{12} =...