Question

why e/m ratio of anode rays is not constant

Answer 1

Atomic masses of different gases are different and hence the mass of anode ray particles varies when you use different gases in the discharge tube and hence the e/m ratio varies

Answer 2

it is because..

the cathode rays have electrons in them and the q and m of all electons are constant so the specific charge is also constant

but in the case of anode rays they have +ve ions of diff gases so the mass of gases will diff accordingly

for eg.O has mass 16 but H has mass 1

so this concluded that the specific charge of anode rays arent constant

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