## Speed of cosmic ray muons

Cosmic ray detectors were separated vertically by several meters and the arrival time of the muon at each detector was used to measure the speed of the muon. During the 2007 workshop, students from Gwendolyn Brooks High School measure the speed of the muon to be 2.91m/s = 0.98c with a statistical error of 5%, where c is the speed of light c= 2.998m/s) Speed of cosmic ray muons workshop. After the 2008 workshop, students from Glenbrook South High School repeated the experiment with detectors at their school, paying special attention to systematic errors, and was able to improve the measurement of the speed of the muon to be 0.997c+-0.004c. They published in the Journal of the Illinois Science Teachers Association: Measurement of Ultimate Speed: A High School Experience.