Question

If you were to double the current through the filament (the cathode), which of the following would be true? 1) The electron charge to mass ratio would decrease 2) The electron charge to mass ratio would increase 3) The electron charge to mass ratio would remain the same 4) Cannot be determined

Answer 1

Doubling the current through the filament (the cathode) would not change the electron charge to mass ratio as it is a fundamental and constant property of electrons.

Step-by-step explanation:

If you were to double the current through the filament (the cathode), the electron charge to mass ratio would remain the same. This is because the charge-to-mass ratio of the electron is a fundamental property of the electron and does not depend on the current through the circuit or the intensity of the cathode rays. According to J.J. Thomson's experiments, this ratio is a constant for electrons regardless of changes in external conditions such as the type of gas in the cathode ray tube or the metal used for the electrodes.