Dr. William Bertozzi - Massachusetts Institute of Technology
Sometime in 1962
In his youth, Dr. William Bertozzi, an MIT professor who has long been a leader in experimental nuclear physics using beams of electrons, carried out an experiment in which he explored the relationship between the velocity of electrons and their kinetic energy by measurements over a range of accelerating voltages between 0.5 MeV and 15 MeV. The kinetic energy is measured using calorimetry and the velocity is measured by time-of-flight. This educational film, made in 1962, documents the experiment and shows that the electrons have a limiting speed equal to that of light, in agreement with Einstein's theory of relativity.
The video is only available on Jefferson Lab's video server. Clicking this link will open the video stream in a helper application (QuickTime Player, Windows Media Player, etc...). Be patient! It may take a few moments for the helper application to load, connect to the video server and begin playing.