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DP IB Physics: HL

Topic Questions

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4.2 Travelling Waves

Question 1

Marks: 1

The intensity, I,  of a sound wave is inversely proportional to the square of the distance, d, from the source and directly proportional to the square of the amplitude, A

At distance d from the point source of a sound wave, the amplitude of the wave is 6 A.

What is the amplitude at a distance of 3 d?

  • 1 third A

  • 2 A

  • 3 A

  • 6 A

Choose your answer
  
Key Concepts
Properties of Waves

Question 2

Marks: 1

The diagram shows a cross-sectional view through a water wave travelling from left to right.

4-2-sl-mcq-hard-q2-phy

At which point is the water moving with maximum speed in the upward direction?

    Choose your answer
      

    Question 3

    Marks: 1

    The table below contains the frequencies of various parts of the electromagnetic spectrum. 

    Which row correctly describes X as infrared and Y as X-rays?

     

    X

    Y

    A.

    3 × 105 Hz

    3 × 1020 Hz

    B.

    3 × 1010 Hz

    3 × 1016 Hz

    C.

    3 × 1018 Hz 3 × 1014 Hz

    D.

    3 × 1014 Hz

    3 × 1019 Hz

      Choose your answer
        
      Key Concepts
      Electromagnetic Waves

      Question 4

      Marks: 1

      The diagram shows a wave with a frequency of 25 Hz travelling from left to right.

      4-2-sl-mcq-hard-q4-phy

      At this particular instant in time, the displacement from the equilibrium position of point X is zero.

      What is the shortest time to elapse for the displacement of point Y to be zero?

      • 0.005 s

      • 0.01 s

      • 0.05 s

      • 0.10 s

      Choose your answer
        
      Key Concepts
      The Wave Equation

      Question 5

      Marks: 1

      The graphs below show the displacement of a wave as a function of time and position.

      4-2-sl-mcq-hard-q5-phy

      What is a correct expression for wave speed?

      • fraction numerator 2 P Q over denominator 3 end fraction

      • fraction numerator 3 P Q over denominator 2 end fraction

      • fraction numerator 2 Q over denominator 3 P end fraction

      • fraction numerator 3 Q over denominator 2 P end fraction

      Choose your answer
        
      Key Concepts
      The Wave Equation

      Question 6

      Marks: 1

      The graph shows the displacement, x, of a wave pulse as a function of distance, d

      4-2-sl-mcq-hard-q6-phy

      Which graph correctly shows the displacement of the wave pulse as a function of time, t?

      4-2-sl-mcq-hard-q6-ans-phy

        Choose your answer
          

        Question 7

        Marks: 1

        The star Deneb emits EM waves of wavelengths 500 µm, 5 µm, 0.5 µm and 0.005 µm.

        Which row correctly identifies the areas of the EM spectrum to which these wavelengths belong?

         

        500 µm

        5 µm

        0.5 µm

        0.005 µm

        A.

        Microwave

        Infrared

        Visible

        Ultraviolet

        B.

        Radio

        Microwave

        Infrared

        Visible

        C.

        Infrared Visible Ultraviolet X-ray

        D.

        Microwave

        Infrared

        Ultraviolet

        Gamma

          Choose your answer
            
          Key Concepts
          Electromagnetic Waves

          Question 8

          Marks: 1

          Visible light has wavelengths ranging from 400 nm to 700 nm.

          What is the maximum frequency of visible light?

          • 3 × 10−18 Hz

          • 7.5 × 10−18 Hz

          • 3 × 10−16 Hz

          • 7.5 × 10−14 Hz

          Choose your answer
            
          Key Concepts
          The Wave Equation

          Question 9

          Marks: 1

          The diagram shows the positions of three points on a string as a transverse wave travels along it from left to right.

          4-2-sl-mcq-hard-q9-phy

          Which row correctly shows the velocities of the points on the string?

           

          1

          2

          3

          A.

          B.

          C.

          D.

            Choose your answer
              

            Question 10

            Marks: 1

            The diagram below shows a water particle on the crest of a wave in a ripple tank. 

            4-2-sl-mcq-hard-q10-phy

            Which arrow correctly shows the force acting on the particle?

              Choose your answer
                
              Key Concepts
              Properties of Waves