Science Common Sense

1702 - What are the measurements of the electron's charge-to-mass ratio and electric charge in the Millikan oil drop experiment and Thomson's cathode ray tube experiment?

The measurements of the electron's charge-to-mass ratio and electric charge in the experiments are:

• Millikan oil drop experiment:
• Electron charge: approximately -1.602 x 10^-19 Coulombs

• Electron charge-to-mass ratio was not directly measured, but electron charge was.

• Thomson's cathode ray tube experiment:

• Electron charge-to-mass ratio: approximately -1.759 x 10^11 Coulombs per kilogram
• Electron charge was not directly measured, but the ratio was. However, by using other measurements and combining the results of both experiments, we got the charge and ratio values we know today.