Lalit Patel
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Posted 5 year ago
By which method  mass of electron calculated?
1 Answer(s)
Mitesh Sharma
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Posted 5 year ago Mitesh Sharma

Historically, it was done in two steps. First, the mass-to-charge ratio was calculated by JJ Thomson in 1897. By firing electrons from a cathode gun at a known velocity, through an electric field of known strength, he was able to observe how much the field deflected the beam.