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Marching Band doppler effect with Beat Frequency.

  1. Jun 21, 2015 #1
    1. The problem statement, all variables and given/known data
    Emma and Don are playing in a band. While emma is marching toward Don, Don tunes his instrument to match the note that emma is playing. When emma stops, don immediately notices a beat frequency of 5 Hz. If the speed of the sound is 330m/s what is the relationship between Emmas speed and the frequency she is emmiting?

    2. Relevant equations
    fobs=f0[(v)/(v+-vsource)]
    Bear Frequency= |f2-f1|
    v=ƒλ

    3. The attempt at a solution
    at the speed which emma is moving, her note due to the doppler effect is shifted to a higher pitch which is what don tunes his instrument too. when she stops, the frequency of emmas note drops by 5Hz, to the actual note which was truly being played. Thats all i understand... whats the best way to get started?
     
  2. jcsd
  3. Jun 21, 2015 #2
    Just to add to what I just said, we can represent that first part through

    fobs=f0+5
    therfore
    f0+5=f0[(v)/(v-vEmma)]
     
  4. Jun 21, 2015 #3

    Nathanael

    User Avatar
    Homework Helper

    Isn't that a relationship between Emma's speed and the frequency she's playing? So what's the problem?
     
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