Radioactive Substances Quiz Questions

15 Questions | Total Attempts: 42

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Radioactive Substances Quiz Questions

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Questions and Answers
  • 1. 
    The nucleus of a particular form of carbon (chemical symbolC) contains 6 protons and 7 neutrons. Which of the following isthe correct way to represent it?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 2. 
    A particular nuclide of iron (chemical symbol Fe) is representedas follows:
    • A. 

      56 neutrons

    • B. 

      26 electrons

    • C. 

      26 neutrons

    • D. 

      26 protons

  • 3. 
    How many neutrons does this nuclide have?
  • 4. 
    Which symbol represents a beta particle?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 5. 
    Which symbol could represent an alpha particle?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 6. 
    A radioactive nuclide X decays according to this equation:
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 7. 
    A radioactive sample contains 8000 undecayed atoms. It hasa half-life of 4 days. What will be the number of undecayedatoms remaining after 12 days?
  • 8. 
    The graph shows the pattern of decay of a radioactive substance.What is the half-life of the substance?
  • 9. 
    The graph bellow shows the amount of undecayed material in a sample of a radioactive substance as it decayed. When the material had decayed to a very low level, the detector still recorded background radiation.From the graph, determine the background count rate.
  • 10. 
    The graph bellow shows the amount of undecayed material in a sample of a radioactive substance as it decayed. When the material had decayed to a very low level, the detector still recorded background radiation.Determine the initial count rate due to the radioactive substance by calculating:initial count rate - background count rate
  • 11. 
    Which part of the atom contains most of its mass?
    • A. 

      Shells

    • B. 

      Orbits

    • C. 

      Nucleus

    • D. 

      Neutron

  • 12. 
    The diagram shows the paths of some alpha particles as they approached a nucleus of a gold atom.Explain why the alpha particle (1) shown was back-scattered.
    • A. 

      It's pushed back repelled by the nucleus when it passes by very near.

    • B. 

      It's pushed back attracted by the nucleus when it passes by very near.

    • C. 

      It's pushed back repelled by the nucleus when it passes by far away.

    • D. 

      It's pushed back attracted by the nucleus when it passes by far away.

  • 13. 
    The diagram shows the paths of some alpha particles as they approached a nucleus of a gold atom.Explain why the alpha particle (2) shown was undeflected as it passed the gold nucleus.
    • A. 

      They have unlike charges.

    • B. 

      It's too close to the nucleus.

    • C. 

      They have like charges but it's far away from the nucleus.

    • D. 

      All alpha particles are deflected.