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Experiment to Measure the Increase in Electron Mass with Velocity
Journal article   Peer reviewed

Experiment to Measure the Increase in Electron Mass with Velocity

Kenneth N. Geller and Richard Kollarits
American journal of physics, v 40(8), pp 1125-1130
Aug 1972

Abstract

An experiment is described for measuring the mass increase with velocity of relativistic electrons. A beta-ray spectrometer is used to momentum-analyze electrons emitted from a Tl 204 source, and a semiconductor detector is used to measure the energy of the electrons. The energy calibration of the semiconductor detector is established absolutely. The experimental results serve to verify the predictions of special relativity, and provide precise values for the electron rest mass and the speed of light.

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