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DP IB Physics: SL

Topic Questions

Home / IB / Physics: SL / DP / Topic Questions / 7. Atomic, Nuclear & Particle Physics / 7.1 Discrete Energy & Radioactivity / Multiple Choice


7.1 Discrete Energy & Radioactivity

Question 1

Marks: 1

The energy level diagram below shows six possible transitions between the energy levels of an atom. Each transition between levels creates a photon of definite energy and frequency.

7-1-sl-mcq-hard-q1-phy

The increase in frequency is from left to right.

Which of the following spectrum corresponds most closely to the transitions?

7-1-sl-mcq-hard-q1_2-phy

    Choose your answer
      

    Question 2

    Marks: 1

    A particular nucleus, X presubscript Z presuperscript A decays to form Y presubscript z presuperscript a, which then has two possible decay paths, resulting in either an isotope of Thallium (Tl) or Polonium (Po), as shown.

    7-1-sl-mcq-hard-q2-phy

    Which isotope could not be straight X presubscript straight Z presuperscript straight A?

    • Pb presubscript 82 presuperscript 215

    • Po presubscript 84 presuperscript 214

    • At presubscript 85 presuperscript 218

    • Pb presubscript 82 presuperscript 214

    Choose your answer
      

    Question 3

    Marks: 1

    The decay series for Thorium–232 can be plotted as shown.

    7-1-ib-sl-hard-mcqs-q3-question

    According to the diagram, how many possible routes are available for Thorium–232 to decay to a stable nucleus of lead−208?

    • 2

    • 4

    • 10

    • 12

    Choose your answer
      

    Question 4

    Marks: 1

    The diagram shows the decay chain for a particular isotope.

    7-1-sl-mcq-hard-q4-phy

    What are the isotopes labelled 1, 2 and 3?

     

    1

    2

    3

    A

     T presubscript 90 presuperscript 230 h  A presubscript 85 presuperscript 218 t  P presubscript 82 presuperscript 210 b

    B

     U presubscript 92 presuperscript 234  A presubscript 85 presuperscript 218 t  P presubscript 82 presuperscript 210 b

    C

     U presubscript 92 presuperscript 234  P presubscript 84 presuperscript 218 o  T presubscript 81 presuperscript 210 l

    D

     T presubscript 90 presuperscript 230 h  P presubscript 84 presuperscript 218 o  P presubscript 82 presuperscript 210 b

      Choose your answer
        

      Question 5

      Marks: 1

      Polythene film is made by extruding polythene and drawing it into a long sheet which is wound onto a roll, as shown in the diagram below.

      7-1-sl-mcq-hard-q5-phy

      The manufacturer has to carefully choose a radioactive isotope which will effectively remove any electrostatic charge that has built up on the film. The manufacturer also has to consider the point X, Y or Z at which the radioactive isotope should be placed along the assembly line.

      At which point should the radioactive isotope be placed, and which type of radiation should the manufacturer choose to remove excess electrostatic charge?

        Point Type of radiation
      A X alpha
      B X gamma
      C Y beta
      D Z alpha
        Choose your answer
          

        Question 6

        Marks: 1

        Transitions between three energy levels in a particular atom give rise to the three spectral lines of frequencies, in decreasing magnitude f subscript 1, f subscript 2 and f subscript 3 with wavelengths lambda subscript 1, lambda subscript 2 and lambda subscript 3.

        Which of the following correctly relates f subscript 1, f subscript 2 and f subscript 3 and lambda subscript 1lambda subscript 2 and lambda subscript 3

          Frequency Wavelength
        A. f subscript 3 equals f subscript 1 plus f subscript 2 1 over lambda subscript 1 equals 1 over lambda subscript 2 plus 1 over lambda subscript 3
        B. f subscript 3 equals f subscript 1 minus f subscript 2 1 over lambda subscript 1 equals 1 over lambda subscript 2 plus 1 over lambda subscript 3
        C. 1 over f subscript 1 equals 1 over f subscript 2 minus 1 over f subscript 3 lambda subscript 1 equals lambda subscript 2 plus lambda subscript 3
        D. 1 over f subscript 1 equals 1 over f subscript 2 plus 1 over f subscript 3 1 over lambda subscript 3 equals 1 over lambda subscript 1 minus 1 over lambda subscript 2
          Choose your answer
            

          Question 7

          Marks: 1

          Radioactive isotopes are used in medical imaging.

          For example, two isotopes of iodine, 123-I and 131-I are both used by radiographers, who give them to patients in the form of iodide before taking scans.

          The possible decay equations for these isotopes are:

          1. I presubscript 53 presuperscript 123 space rightwards arrow space T presubscript 52 presuperscript 123 e + _____

                2. I presubscript 53 presuperscript 131 space rightwards arrow space X presubscript 54 presuperscript 131 e + _____

          Which is a correct difference between these two decays?

          • In decay 1, an electron neutrino is emitted, but in decay 2 an anti-electron neutrino is emitted

          • In decay 1, an electron has been absorbed but in decay 2 a neutron has been absorbed

          • In decay 1, an anti-electron neutrino is emitted, but in decay 2 an electron neutrino is emitted

          • In decay 1, a neutron became a proton but in decay 2 a proton became a neutron

          Choose your answer
            

          Question 8

          Marks: 1

          The graph shows the how the neutron-proton ratio of stable nuclei changes as proton number increases.

          7-1-sl-mcq-hard-q8-phy

          What other changes with increasing proton number are suggested by the graph?

          1. The charge-mass ratio increases
          2. The charge-mass ratio decreases
          3. The likelihood of α-decay increases
          4. The likelihood of β-positive decay increases
          5. Protons outnumber neutrons in large nuclei, with a rapidly increasing ratio
          • 1 and 3

          • 2 and 3

          • 2, 4 and 5

          • 2, 3 and 5

          Choose your answer
            

          Question 9

          Marks: 1

          The charge to mass ratio, Q over m, is also known as the specific charge.

          What is the ratio of fraction numerator s p e c i f i c space c h a r g e space o f space Li presubscript 3 presuperscript 7 over denominator s p e c i f i c space c h a r g e space o f space scriptbase straight O to the power of 2 plus end exponent end scriptbase presubscript 8 presuperscript 16 end fraction?

          • 6 over 7

          • 7 over 6

          • 24 over 7

          • 7 over 24

          Choose your answer
            

          Question 10

          Marks: 1

          The number of undecayed atoms, N, of a radioactive substance after time, t, can be calculated by the equation:

          N equals N subscript 0 open parentheses 1 half close parentheses to the power of t over T subscript 1 half end subscript end exponent

          Where:

          • T subscript 1 half end subscript= the half-life 
          • N subscript 0= the original number of atoms

          Two radioactive elements X and Y have half–lives TX and TY respectively. An initial sample contains three times as many atoms of X, NX than atoms of Y, NY.

          After a certain time, t, which of the expressions for fraction numerator n u m b e r space o f space d e c a y e d space a t o m s space o f space X over denominator n u m b e r space o f space d e c a y e d space a t o m s space o f space Y end fraction is correct?

          • fraction numerator 3 open parentheses N subscript Y minus N subscript Y open parentheses begin display style 1 half end style close parentheses to the power of begin display style t over T subscript X end style end exponent close parentheses over denominator N subscript Y minus N subscript Y open parentheses begin display style 1 half end style close parentheses to the power of begin display style t over T subscript Y end style end exponent end fraction

          • fraction numerator N subscript X open parentheses 1 half close parentheses to the power of t over T subscript X end exponent minus N subscript X over denominator N subscript Y open parentheses 1 half close parentheses to the power of t over T subscript Y end exponent minus N subscript Y end fraction

          • fraction numerator N subscript X open parentheses 1 half close parentheses to the power of t over T subscript X end exponent over denominator N subscript Y open parentheses 1 half close parentheses to the power of t over T subscript Y end exponent end fraction

          • fraction numerator 3 N subscript Y open parentheses 1 half close parentheses to the power of t over T subscript Y end exponent over denominator N subscript Y open parentheses 1 half close parentheses to the power of t over T subscript Y end exponent end fraction

          Choose your answer