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Homework Help: Frequency of Whistle

  1. Jan 28, 2010 #1
    1. The problem statement, all variables and given/known data

    You blow a whistle of frequency 769 Hz, as you move towards a wall.

    The frequency of beats you hear from the whistle and the reflected sound is 11 beats/s.

    How fast are you moving towards the wall?

    Give your answer in m/s and to two significant figures.

    Only answer in numerical values, no units.

    2. Relevant equations

    3. The attempt at a solution

    769 + 11 = 780hz. Which I believe is the new frequency

    Now what?
    Thanks in advance
  2. jcsd
  3. Jan 28, 2010 #2
    You should use the Doppler Effect.
  4. Jan 28, 2010 #3
    Thanks I got it
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