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Finding the wavelength and frequency

  1. Nov 25, 2009 #1
    1. The problem statement, all variables and given/known data

    A sound source is moving at 80 m/s toward a stationary listener that is standing in still air. The source emits sound at a frequency of 200Hz. Assume that the sound travels at still air at 343 m/s.

    1. The wavelength of the sound in the region between the source and the listener is

    A. 2.12 m
    B. 1.72 m
    C. 1.32 m
    D. 1.82 m


    2. The frequency heard by the listener using the above wavelength is

    A. 261 Hz
    B. 320 Hz
    C. 199 Hz
    D. 162 Hz

    A sound source is moving at 80 m/s from a stationary listener that is standing in still air. The source emits sound at frequency of 200 Hz that travels in still air at 343 m/s.


    3. The wavelength of the sound in the region between the source and the listener is

    A. 2.12 m
    B. 1.72 m
    C. 1.32 m
    D. 1.82 m


    4. The frequency heard by the listener

    A. 260 Hz
    B. 320 Hz
    C. 199 Hz
    D. 162 Hz

    2. Relevant equations



    3. The attempt at a solution

    So the first one I got it as 343-80=263 m/s Then wavelength = velocity / frequency = 263/200 = 1.32

    2. Frequency = velocity/wavelength = 343/1.32 = 261 HZ

    3. 343+80=423 m/s wavelength= 423/200 = 2.12

    4. Frequency = 343/2.12 = 162 Hz

    Are these correct?
     
  2. jcsd
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