Speed of Light, Physics 3901, Fall 04

The oscilloscope shows the signal from a photo-detector when the laser (white, lower right) is modulated by a 1 MHz signal from the signal generator.

Pathlengths of 11.5 and 18.1 meters were used. Both gave velocities of about 2.3 x 108 m/s for c. The measured times were 0.05 and 0.08 microseconds for the two cases.

c-Team Experimenters: Andrew Stallard, Jericho Cain, Leigh Buholtz, Saee Razi.

Physics 3901