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DP IB Physics: SL

Topic Questions

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4.3 Wave Characteristics

Question 1

Marks: 1

An unpolarised electromagnetic wave passes through 2 polarisers. The second polariser is at a clockwise angle a to the vertical.

4-3-sl-mcq-hard-q1-phy

When a = 225 ° what percentage of the unpolarised light is transmitted through both filters?

  • 25%

  • 50%

  • 12.5%

  • 6.25%

Choose your answer
  
Key Concepts
Polarisation

Question 2

Marks: 1

Cinema 3D glasses have polarising lenses aligned 90o from each other. The left eye contains a horizontal polariser and the right lens contains a vertical polariser.

4-3-ib-sl-hard-mcqs-q2-question

A person stands in front of a mirror and closes their left eye.

How do the glasses appear in the mirror?

  • Both lenses black

  • The left lens is black

  • The right lens is black

  • Both lenses are clear

Choose your answer
  

Question 3

Marks: 1

The diagram shows a wave moving along a rope under tension in the direction shown.

4-3-ib-sl-hard-mcqs-q3-question-diagram-1

Which of the following graphs, A to D, correctly shows the variation of displacement s with time t of the particle K in the rope?

4-3-ib-sl-hard-mcqs-q3-question-diagram-2

    Choose your answer
      
    Key Concepts
    Superposition

    Question 4

    Marks: 1

    Plane-polarised electromagnetic waves of radio frequency are transmitted by a vertical aerial and have an amplitude A. They are received by a second aerial rotated at angle theta compared to the transmitting aerial. 

    Which of the following expressions is proportional to the power received by the second aerial?

    • A cos theta

    • A cos squared theta

    • A squared cos squared theta

    • A squared cos theta

    Choose your answer
      

    Question 5

    Marks: 1

    A beam of plane-polarised light of intensity I is incident at right-angles to a polariser. The transmitted light has an intensity of 1 fourth I

    What is the angle, theta, between the plane of polarisation of the incident light and the polariser?

    Use the values in the table to help.

    4-3-sl-mcq-hard-q5-phy

    • 30 °

    • 45 °

    • 60 °

    • square root of 2 over 3 end root °

    Choose your answer
      
    Key Concepts
    Malus’s Law

    Question 6

    Marks: 1

    A wave has frequency f, intensity I and amplitude A. The intensity of a wave is proportional to the square of the frequency.

    A second similar wave has frequency 2 fand amplitude 1 third A.

    Which of the following is an expression for the intensity of the second wave, I subscript 2?

    • 2 over 9 I

    • 2 over 3 I

    • 3 over 2 I

    • 4 over 9 I

    Choose your answer
      
    Key Concepts
    Amplitude & Intensity

    Question 7

    Marks: 1

    Light from a lamp is incident on a polarising filter that has a horizontal transmission axis. The incident light has intensity I subscript 0 and the transmitted light has intensity I subscript 1. The filter is rotated by 2π.

    Which graph correctly shows the variation of the ratio I subscript 1 over I subscript 0 with angle theta?

    4-3-sl-mcq-hard-q8-phy

      Choose your answer
        

      Question 8

      Marks: 1

      Identify the pair of statements which are always true for electromagnetic waves

      A.

      Always travel at the same speed in a vacuum

      Always obey the inverse square law

      B.

      Can undergo plane polarisation

      Consist of electric and magnetic fields which have constant amplitude

      C.

      Have predictable reduction in intensity when passed through a polarising filter

      Always travel at the same speed in a vacuum

      D.

      Consist of electric and magnetic fields which transfer energy

      Are always polarised

        Choose your answer
          

        Question 9

        Marks: 1

        The intensity of radiation from a star is given by I subscript 0. The intensity of light at the surface of one of its planets, a distance r from the star is 0.25 I subscript 0. The distance between the star and a second planet is 3r

        What is the intensity of light from the star on this second planet?

        • I subscript 0 over 36

        • I subscript 0 over 12

        • I subscript 0 over 9

        • fraction numerator 4 I subscript 0 over denominator 9 end fraction

        Choose your answer
          

        Question 10

        Marks: 1

        Light from the sun reflects off the surface of a pond. Some of the light continues into the water where it is refracted. 

        Which line in the table gives the correct nature of the reflected and refracted light?

          Reflected Refracted
        A. unpolarised completely plane polarised
        B. completely plane polarised completely plane polarised at right angles to the reflected light
        C. partially plane polarised unpolarised
        D. completely plane polarised partially plane polarised
          Choose your answer