On 8/23/07, Eugene Salamin <gene_salamin@yahoo.com> wrote:
Let's look at the Doppler shift in light due to the velocity v of an observer.....
I've been wondering from time to time about a different question about Doppler: Suppose you are driving along a motorway exceeding the speed limit, and you notice a cop with a speed gun aimed at you and he/she is about to take a reading of your speed. You jam on the brakes, and the reading is actually taken as you are deccelerating. How is the reading on the gun affected? Could it appear that you are below the speed limit when in fact you are above it? This happened to, er, a friend of mine who didn't get a ticket. (Of course there are many other possible explanations as to why he didn't get a ticket.) Gary McGuire