1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: The Doppler Effect

  1. Dec 9, 2014 #1
    1. The problem statement, all variables and given/known data
    A train moving at a constant speed is passing a stationary observer on a platform. A flute player is playing a note with a frequency of 940Hz. after the flute has passed, the observer hears the sound frequency of 915Hz. What is the speed of the train? The speed of sound in air is 343m/s.

    2. Relevant equations

    Fo = Fs (1/(1+(Vs/V))

    3. The attempt at a solution

    Vs = ((Fs/Fo) - 1) * V

    When i input the given information I keep getting the wrong answer. Is my arithmetic wrong or am I missing something completely?
  2. jcsd
  3. Dec 9, 2014 #2
    What is the given answer and what are you getting?
  4. Dec 9, 2014 #3
    A) 7.3 m/s
    B) 12 m/s
    C) 21 m/s
    D) 32 m/s
    E) 42 m/s

    I get 9.4 m/s
  5. Dec 9, 2014 #4
    Same here unfortunately.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted