Discovery of the Electron
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Questions and Answers

What is the charge of cathode rays?

  • Neutral
  • Variable
  • Positive
  • Negative (correct)
  • Who concluded that all atoms must contain electrons based on the behavior of cathode rays?

  • Dalton
  • Thomson (correct)
  • Bohr
  • Rutherford
  • When an external electrical field is present, how do cathode rays behave?

  • Travel straight from cathode to anode
  • Bend towards the positive plate (correct)
  • Remain stationary
  • Bend towards the negative plate
  • What is the name given to the particles constituting the cathode rays?

    <p>Electrons</p> Signup and view all the answers

    Why did Thomson conclude that all atoms must contain electrons?

    <p>Nature of cathode rays was the same irrespective of the metal or gas used in the cathode ray tube</p> Signup and view all the answers

    What did Thomson's conclusion about atoms being divisible imply?

    <p>Atoms are not indivisible as believed by Dalton and others</p> Signup and view all the answers

    What did Sir J.J. Thomson conclude about the particles constituting cathode rays?

    <p>They have negligible mass but travel very fast</p> Signup and view all the answers

    How do cathode rays behave in the absence of an external magnetic or electric field?

    <p>They travel in a straight line</p> Signup and view all the answers

    What was observed when very high voltage was passed across the electrodes in an evacuated tube?

    <p>Cathode produced a stream of particles</p> Signup and view all the answers

    What did Eugen Goldstein discover before the electron?

    <p>Anode rays</p> Signup and view all the answers

    What property of cathode rays makes them attract towards a positively charged plate?

    <p>Carrying negative charge</p> Signup and view all the answers

    What was found to be independent of the nature of gas in the cathode ray tube?

    <p>The charge to mass ratio</p> Signup and view all the answers

    Why were anode rays called canal rays?

    <p>For passing through holes in the cathode</p> Signup and view all the answers

    'Cathode rays travel from cathode to anode' implies that:

    <p>Electrons move from negative to positive terminals</p> Signup and view all the answers

    What was observed behind the perforated cathode when a high voltage was applied in Goldstein's experiment?

    <p>Faint red glow</p> Signup and view all the answers

    What characteristic did anode rays share with cathode rays?

    <p>Travel in straight lines</p> Signup and view all the answers

    Why were anode rays also called positive rays?

    <p>Due to their charge</p> Signup and view all the answers

    In Goldstein's experiment, what type of cathode was used?

    <p>Perforated cathode</p> Signup and view all the answers

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