Phonon: Understanding Answers to Q9 and Q10

  • Thread starter Thread starter Lavace
  • Start date Start date
  • Tags Tags
    Phonon
Lavace
Messages
62
Reaction score
0
http://qm-web.library.qmul.ac.uk/exams/science/physics/2008/PHY108.pdf

Questions 9) and 10).

The resources on them are scarce, can't seem to find understandable explanations for it, could anyone give me a hand here?
 
Last edited by a moderator:
Physics news on Phys.org
I can't access the link you posted...
 
Thread 'Need help understanding this figure on energy levels'

Thread 'Need help understanding this figure on energy levels'

This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
View full post »
Thread 'Understanding how to "tack on" the time wiggle factor'

Thread 'Understanding how to "tack on" the time wiggle factor'

The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
View full post »

Similar threads

How Do We Derive the Compton Electron Energy Equation?
Replies
9
Views
3K
A Some fun (yet nice) questions on QFT
Replies
2
Views
1K
A Could Re-Analyzing Redshifts Reveal New Physics?
Replies
0
Views
2K
Sources to study basic logic for precocious 10-year old?
Replies
43
Views
6K
Understanding Wave Functions in a Semi-Infinite Potential Well
Replies
18
Views
3K
Finding the Maximum Current in an LC-only Circuit
Replies
13
Views
41K
[EZ] I could really use some help understanding the following symbols....
Replies
11
Views
2K
Studying How to self study Physics and Mathematics
Replies
10
Views
5K
Longitudinal acoustic phonons: why does the dielectric function vanish?
Replies
6
Views
5K
Feynman lectures question where he explains math in terms of nuts
Replies
7
Views
783

Hot Threads

Recent Insights

Back
Top