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    IAS Physics SB1 Assessment 3A

    Uploaded by

    Liang Lu

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    © All Rights Reserved
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    IAS Physics SB1 Assessment 3A

    Uploaded by

    Liang Lu
    38 views3 pages

    Original Title

    IAS_Physics_SB1_Assessment_3A

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    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    38 views3 pages

    IAS Physics SB1 Assessment 3A

    Uploaded by

    Liang Lu

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 3

    TOPIC 3 WAVES AND PARTICLE NATURE OF LIGHT

    Topic 3A Basic waves


    1 The speed of sound at sea level is 340 ms−1. Humans can hear sounds in the
    range 20 Hz to 20 000 kHz.
    (a) Calculate the wavelengths of sounds at 20 Hz and 20 000 kHz.

    (2)

    ..............................................................................................................................................................

    ..............................................................................................................................................................

    (b) A gun is fired from a ship lying 400 m from some cliffs. A sailor standing
    close to the gun hears the gun fire and hears the echo from the cliffs a short
    time later. Calculate the time between these two sounds being heard.
    (2)

    ..............................................................................................................................................................

    ..............................................................................................................................................................

    (Total for Question 1 = 4 marks)

    2 Explain why it is impossible to hear an explosion in space but it is possible to


    see it.
    (4)

    ..............................................................................................................................................................

    ..............................................................................................................................................................

    ..............................................................................................................................................................

    ..............................................................................................................................................................

    (Total for Question 2 = 4 marks)

    : © Pearson Education Ltd 2018. Copying permitted for purchasing institution only. This material is not copyright free
    3 A microphone is connected to an oscilloscope. The diagram below shows an
    oscilloscope trace obtained when the microphone detects sound from a
    loudspeaker connected to a signal generator. The oscilloscope settings are
    0.2 V cm−1 (y-axis) and 2.0 ms−1 cm (x-axis).

    (a) What is the amplitude of this signal?


    (1)

    ..............................................................................................................................................................

    (b) What is the frequency of this signal?


    (3)

    ..............................................................................................................................................................

    ..............................................................................................................................................................

    ..............................................................................................................................................................

    (Total for Question 3 = 4 marks)

    : © Pearson Education Ltd 2018. Copying permitted for purchasing institution only. This material is not copyright free
    4 When an earthquake occurs P-waves (longitudinal) and S-waves (transverse)
    are created at the epicentre of the quake and travel outwards in all directions at
    different speeds. The P-waves have a speed of about 5.0 kms−1 and the S-
    waves have a speed of about 3.5 kms−1. Seismic stations detect both types of
    wave and measure the time interval between the arrival of the P-waves and
    then the arrival of the S-waves.
    (a) Use diagrams to explain the difference between longitudinal and transverse
    waves.
    (4)

    (b) Calculate the time interval between the arrival of P- and S-waves at a
    seismic station 200 km from the epicentre of the earthquake.
    (2)

    ..............................................................................................................................................................

    ..............................................................................................................................................................

    (c) Another station measures a time interval of 72 s between the arrival of the
    P-waves and the S-waves. How far is this station from the epicentre of the
    earthquake?
    (2)

    ..............................................................................................................................................................

    ..............................................................................................................................................................

    (Total for Question 4 = 8 marks)

    = 20 MARKS

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