When J. J. Thomson discovered the electron, what physical property of the electron did he measure
A) its charge, e
B) its charge-to-mass ratio, e/m
C) its temperature, T
D) its mass, m
E) its atomic number, Z

Question

Quizplus · Accepted Answer

J.J. Thomson measured the charge-to-mass ratio (e/m) of the electron using cathode ray tubes. He found that the charge-to-mass ratio was much larger than that of any known ion, indicating the presence of a particle with a much smaller mass. This led him to propose the existence of the electron as a subatomic particle.

When J J Thomson Discovered the Electron, What Physical Property of the of the Electron