One page paper

Many of us have had the unfortunate experience of being stopped by a police officer for speeding. How did he or she measure your speed? Probably the officer used a radar device.

Write a one page paper, double-spaced and in your own words, on how police radar units work. Be sure to cite the sources that you used. Be sure to include the following keywords in your paper: frequency, beat, beat frequency, constructive interference (of waves), destructive interference (of waves).