Structure of Atom: Chapter 2 Quiz
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Questions and Answers

What is the atomic number or charge number related to?

  • Number of protons (correct)
  • Number of electrons
  • Number of neutrons
  • Number of protons and neutrons

    • Which subatomic particles are found in the nucleus of an atom?

  • Electrons
  • Neutrons and electrons
  • Protons and neutrons (correct)
  • Protons and electrons

    • In a free state, how does the atom generally exist?

  • As a single particle
  • As a combination of protons and electrons
  • As a molecule (correct)
  • As a combination of protons, neutrons, and electrons

    • What did J.J. Thomson's experiments in 1897 reveal about atoms?

    <p>Presence of electrons in atoms</p> Signup and view all the answers

    What does the atomic mass of an element represent?

    <p>Number of protons and neutrons</p> Signup and view all the answers

    What did J.J. Thomson use to detect incident rays in his cathode ray tube?

    <p>A layer of phosphorescent paint</p> Signup and view all the answers

    How did Thomson determine the charge-to-mass ratio (e/m) of cathode rays?

    <p>By measuring their deflection under a magnetic field and their kinetic energy</p> Signup and view all the answers

    What is the formula for the force experienced by a charged particle in an electric field E?

    <p>$FE = qE = - eE$</p> Signup and view all the answers

    What is the formula for the kinetic energy K.E. of an electron?

    <p>$K.E. = (1/2).m.v^2$</p> Signup and view all the answers

    What force is sometimes called fluid resistance in Millikan's experiment?

    <p>$Fs=6Πηr.v$ (drag force or stock force)</p> Signup and view all the answers

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