Mujahid Ahmed
Last Activity: 12 Years ago
Well, they DON''T. It''s just that during earlier experiments, not much was known about the Nucleus. Hence, what the experimenters thought was proton''s e/m, it was actually not that. Let me explain.
When H2 was used, the smallest e/m detected was that of the proton with charge +1.When He gas is used then the ions produced will be He^+and He^2+. The mass-to-charge of the He^+ will be four times greater than the mass-to charge of H^+ produced when hydrogen gas is used. The mass-to-charge of the He^2+ will be twice as great if the ion is detected in the discharge tube. It''s because of neutrons which were not known at that time.
Please Approve if i helped :)