Measurement of the velocity-momentum-energy relations of relativistic electrons and determination of e/m. Energetic electrons from the beta decay of 90SR and its decay product 90Y are sorted according to momentum by a 180 degree magnetic spectrograph, passed through a velocity selector, and detected by a PIN diode detector.
Plots of momentum and energy vs. velocity are compared with the theoretical relations of classical and relativistic dynamics, and the value of the ratio e/m is derived from the data.
Lab Guide (PDF)
Relativistic dynamics lab. (Image courtesy of Junior Lab staff.)
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