Question

The e/m value for electron depends upon

Answer 1

Answer:

e/m of positive particles depends on the nature of gas taken inside the discharge tube because positive particles are ions of gas molecules whose charge and mass vary in accordance with their mass and charge they obtain

Answer 2

Answer:

The e/m ratio for cathode rays

or , Electrons is constant .

It is independent of the nature of gas in discharge tube and nature of cathode or electrodes of tube. This shows that an electron is an universal fundamental particle.