Recent content by mattmatt321

1. Quick question: eigenfunctions

I'm doing quantum mechanics with only a little experience in linear algebra. I've been working on eigenstates/values/functions/whatever for a couple days but still having a little trouble. Here's a question I had recently, and if anyone can do a quick check of my work and point me in the right...
2. Double delta-function potential

Hello, recently I had a problem in QM involving a double delta-function potential. A bunch of qualitative questions were asked, some of which were obvious to me immediately, some of which I made an educated guess on, and others I totally guessed. I'm following Griffiths' textbook in studying QM...
3. Writing Lagrangian

Thanks, that was my primary question. I'm always a little worried when I'm doing problems like this, that the different parts of the system are actually interacting with each other, and I'll forget term(s) in the kinetic energy.
4. Writing Lagrangian

Homework Statement I worked a textbook problem earlier where I had to write the Lagrangian for a pendulum (of mass m and length l) connected to a massless support moving along the x-axis. I chose the angle theta as my generalized coordinate, since the problem specified that the acceleration of...
5. Surface integral without using Gauss's Theorem

Homework Statement Find the value of the surface integral \intA \bullet da, where A = xi - yj + zk, over the surface defined by the cylinder c2 = x2 + y2. The height of the cylinder is h. Homework Equations I found the answer quite easily using Gauss's theorem, as the divergence of the...
6. Shrodinger Equation for Multiple Particles

Homework Statement Five identical non-interacting particles are placed in an infinite square well with width L = 1 nm. I am asked to find the energy of the system if the particles are electrons. Homework Equations The time-independent Schrodinger equation for a system of two particles...
7. Loop Equation in Circuit

Homework Statement What is the magnitude i in the figure below, if all resistances are 4 ohms, and all batteries are ideal with an emf of 12.4 V? http://edugen.wiley.com/edugen/courses/crs1650/art/qb/qu/c27/pict_27_70.gif Homework Equations The Attempt at a Solution I realize I...