α-particle Scattering Experiment
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Questions and Answers

What was the unexpected result of the α-particle scattering experiment?

  • Most of the fast-moving α-particles passed straight through the gold foil. (correct)
  • All of the α-particles were deflected by the foil at large angles.
  • All of the α-particles rebounded back towards the source.
  • None of the above
  • Why did Rutherford compare the result of the α-particle experiment to firing a 15-inch shell at tissue paper?

  • To emphasize the weight of the α-particles.
  • To illustrate the small deflections observed in the experiment.
  • To highlight the unexpected nature of some α-particles rebounding. (correct)
  • None of the above
  • What conclusion did Rutherford draw from the fact that most α-particles passed through the gold foil without getting deflected?

  • The space inside the atom is mostly filled with positive charge.
  • The atom is mostly filled with electrons.
  • Most of the space inside the atom is empty. (correct)
  • None of the above
  • Why was one out of every 12000 α-particles rebounding considered surprising?

    <p>Because it was unexpected based on classical physics predictions.</p> Signup and view all the answers

    What did Rutherford's observation that very few particles were deflected indicate about the positive charge of the atom?

    <p>The positive charge occupies very little space within the atom.</p> Signup and view all the answers

    In Rutherford's analogy, if a blind-folded child throws stones at a barbed-wire fence, why are most stones not heard striking the fence?

    <p>The stones pass through gaps in the wire without hitting it.</p> Signup and view all the answers

    What did Rutherford's gold foil experiment indicate about the atom?

    <p>The positive charge and mass of the atom are concentrated in a small nucleus.</p> Signup and view all the answers

    According to Rutherford's nuclear model of the atom, where is most of the mass of an atom located?

    <p>In the nucleus</p> Signup and view all the answers

    Why is the nucleus of an atom considered very small compared to the size of the atom?

    <p>Because it contains all the positive charge and mass of the atom.</p> Signup and view all the answers

    What is one drawback of Rutherford's model of the atom regarding the electron's motion?

    <p>Electrons are expected to accelerate and radiate energy.</p> Signup and view all the answers

    What did Rutherford's experiment suggest about the size relationship between the nucleus and the atom?

    <p>The nucleus is much smaller than the atom.</p> Signup and view all the answers

    What contribution did Rutherford make to our understanding of atomic structure?

    <p>Discovery of the nucleus with the gold foil experiment</p> Signup and view all the answers

    Who proposed a model of an atom similar to that of a Christmas pudding?

    <p>J.J. Thomson</p> Signup and view all the answers

    In Thomson's model of an atom, how were the electrons described?

    <p>Like currants in a Christmas pudding</p> Signup and view all the answers

    Why did Ernest Rutherford select a gold foil for his experiment on atomic structure?

    <p>To observe the deflection of alpha particles by sub-atomic particles</p> Signup and view all the answers

    What type of particles were used in Rutherford's experiment on atomic structure?

    <p>Alpha particles</p> Signup and view all the answers

    How did J.J. Thomson describe the positive charge within an atom?

    <p>As studded all over like the red part of a watermelon</p> Signup and view all the answers

    What was the role of J.J. Thomson's research assistants after his tenure at the Cavendish Laboratory?

    <p>All of them won Nobel prizes</p> Signup and view all the answers

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