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DP IB Physics: HL

Topic Questions

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


7.1 Discrete Energy & Radioactivity

Question 1

Marks: 1

Which of the statements is the correct definition of excitation of an electron?

  • When an electron is removed from or added to an atom

  • When an electron moves down an energy level emitting a photon

  • When an electron is given enough energy to move up an energy level, but not enough to leave the atom

  • When an electron is given enough energy to move up an energy level, and sometimes leave the atom

Choose your answer
  

Question 2

Marks: 1

The diagram below shows the energy levels of a mercury atom.

7-1-discrete-energy--radioactivity-sl-mcqs-easy-q2-question-diagram-1

Which transition produces a photon with the longest wavelength?

7-1-discrete-energy--radioactivity-sl-mcqs-easy-q2-question-diagram-2

    Choose your answer
      
    Key Concepts
    Decay Equations

    Question 3

    Marks: 1

    The diagram shows an energy–level diagram for a hydrogen atom.

    7-1-discrete-energy--radioactivity-sl-mcqs-easy-q3-question-diagram

    How many discrete photon energies could be produced from these energy levels?

    • 3

    • 5

    • 6

    • 7

    Choose your answer
      

    Question 4

    Marks: 1

    Which of the following is not a feature of an emission spectrum?

    • When an electron transitions from a higher energy level to a lower energy level, this results in the emission of a photon

    • An emission spectrum contains a set of discrete wavelengths, represented by coloured lines on a black background

    • An emission spectrum is evidence to show that electrons in atoms can only transition between discrete energy levels

    • An emission spectrum consists of a continuous spectrum containing all the colours with dark lines at certain wavelengths

    Choose your answer
      

    Question 5

    Marks: 1

    A larger version of the hydrogen emission spectrum from the infrared to the ultraviolet region looks as follows:

    7-1-discrete-energy--radioactivity-sl-mcqs-easy-q5-question-diagram

    Using information in the diagram, which hydrogen series corresponds to the highest energy photons being emitted?

    • Lyman series

    • Balmer series

    • Brackett series

    • Pfund series

    Choose your answer
      

    Question 6

    Marks: 1

    An isotope of Am presubscript 95 space end presubscript presuperscript 241 space end presuperscript  undergoes alpha-decay. 

    Which letter on the N-Z graph below represents the correct proton-neutron product of the decay?

    7-1-discrete-energy--radioactivity-sl-mcqs-easy-q6-question-diagram

      Choose your answer
        

      Question 7

      Marks: 1

      Uranium−238 undergoes radioactive decay to become Thorium−234. A second decay occurs and the product is protactinium−234.

      The decay sequence can be represented in equation form, where i, j and k are particles.:

       

      straight U presubscript 92 presuperscript 238 rightwards arrow Th presubscript 90 presuperscript 234 space plus space i

Th presubscript 90 presuperscript 234 rightwards arrow Pa presubscript 91 presuperscript 234 space plus space j space plus space k

        

      What are the correct names of these particles?

       

      i

      j

      k

      A

      alpha

      beta−minus

      electron anti−neutrino

      B

      beta−positive

      beta−minus

      alpha

      C

      beta−minus

      neutron

      photon

      D

      alpha

      beta−positive

      neutron

        Choose your answer
          

        Question 8

        Marks: 1

        What are the correct numbers of protons, neutrons and electrons in a neutral atom of U presubscript 92 presuperscript 234?

         

        protons

        neutrons

        electrons

        A

        92

        92

        92

        B

        92

        142

        92

        C

        142

        92

        142

        D

        234

        142

        92

          Choose your answer
            

          Question 9

          Marks: 1

          What is the charge on, and mass of, an electron neutrino and during what process is an electron neutrino produced?

           

          charge /e

          mass / u

          production of neutrino

          A

          +1

          zero

          during β+ emission

          B

          −1

          +1

          during β emission

          C

          zero

          zero

          during β+ emission

          D

          zero

          0.0005

          during β emission

            Choose your answer
              
            Key Concepts
            Isotopes

            Question 10

            Marks: 1

            A sample of californium−239 has an activity of 4000 Bq. The half−life of californium−239 is 1 minute.

            What will the activity be after 4 minutes?

            • 4000 Bq

            • 1000 Bq

            • 500 Bq

            • 250 Bq

            Choose your answer