Grade 11Physical Chemistry
How to derive charge to mass ratio of elecrons and protons?
How to derive charge to mass ratio of elecrons and protons?
1 Answer
Vikas TU
I am not sure if Thompson ever determined the charge-to-mass ratio of a proton, but currently, the most precise measurements of the charge-to-mass ratio of a proton still use a magnetic field like Thompson, but rely on measuring (cyclotron) frequencies rather than deflection. As frequencies are the quantities that can be determined most accurate (see the Nobel lecture of Hänsch: “Never measure anything but frequency!” ), the result is much more precise.
v = qB/2pim
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