Site Archives Lectures
Checking Units
A short video on checking units in a calculation using the Friday Problem Solving Problem #1 as an example.
Cross Products - A Brief Review
A little review of cross products and why they show up when we talk about magnetic fields. there are a few glitches I didn’t have time to edit out.
Drude model notes, The Fatal Current
Two items:1. The notes for the Drude model of conduction from Wednesday.2. A page from Junior lab called “The Fatal Current” about what happens if you electrocute yourself.
Proof of Gauss’ Law
A short proof of Gauss’ Law, also including a discussion of solid angle. Unfortunately, I placed the camera so my head was cut off, but most of you know what I look like.
Long distance dipole approximation
Today (Wednesday Feb. 13, 2008) I showed you the exact expression for a dipole and the expression for r>>a. I mentioned the long distance (r>>a) was a little complex. I’ve written up both calculations here.
Amplifiers, input and output resistance
Amplifiers are not just about gain, they are much more about matching output and input resistance in a signal chain. The idea of negative feedback was invented by H.S. Black in 1927. Here is a link to a paper describing the evolution of the idea.
PS Yes, that is a rip in my pants in the video.
Coaxial transmission lines - 1
In this part, we pose an interesting question, work out the characteristic impedence of a transmission line and learn how to terminate a line.
Fitting - 2 - Poisson Statistics
In this podcast, we talk about using the Poisson distribution in fits where bins have fewer than ten counts. As an example, I’ve generated 100 data sets for the muon lifetime experiment and fit each one using Gaussion and Poisson statistics. The Gaussian fit has a mean fit value of 2.02 microsconds, while the Poisson has 2.29 microseconds. These are for the same data sets generated with a 2.2 microsecond muon lifetime.
Fitting - Part 1
Basic ideas behind chi-squared fits. Here is a wrieup from the Particle Data Book on using the chi-squared test for goodness of fit.
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