Why perforated cathode is used in goldstein experiment?
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Goldstein used a gas-discharge tube which had a perforated cathode. ...Goldstein called these positive rays Kanalstrahlen, "channel rays" or "canal rays", because they were produced by the holes or channels in the cathode
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the perforated cathode was used in canal Ray tube because when protons comes from anode they are attracted towards cathode and pass through the holes ..the cathode back is coated with flourescence material and protons will produce flourescence on glass tube .. while in case of anode it is not perforated because electrons have low mass than protons and have high energy so they can easily scatter and produce flourescence..while protnos mass is higher they can be attracted towards cathode and absorbed by it hence kept perforated..
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