Why does the charge to mass ratio of positive rays depends on the gas taken in the discharge tube whereas charge to mass ratio of cathode rays is same for all gases?
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The positive beams are very charged particles (not protons, except if the gas in the release tube is hydrogen).
At the point, when the charge to mass proportion is estimated the mass of the moving positive charge will be the mass of the core of whatever gas is in the release tube.
Cathode beams are comprised of electrons and all electrons have same charge-to-mass proportion. That is the reason charge to mass proportion of all cathode beams is same.
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