1. Not finding help here? Sign up for a free 30min 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!

Doppler formula help please!

  1. May 30, 2012 #1
    doppler formula help please!:)

    Hello, i see the doppler formula in 2 different forms one being f1=f2 (Vw/Vw-Vs) and the other f1=f2/(1+Vs/Vw)

    f1= Doppler frequency
    f2= Source frequency
    Vw= Speed of sound
    Vs= Speed of source

    the problem i am having is understanding how these are equivalent? how fit they get from one to the other? And how would you solve for Vs in the first doppler equation stated? any help would be greatly appreciated :)
     
  2. jcsd
  3. May 30, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    hello chiuda! :smile:

    if you replace Vs by -Vs, they're the same! :wink:
     
  4. May 30, 2012 #3
    Re: doppler formula help please!:)

    yes i understand that part but lets say the 2nd eqn was already -vs how does one get from the first equation to the second one? it would be very appreciated if all the steps could be shown thank you :)
     
  5. May 30, 2012 #4
    Re: doppler formula help please!:)

    Try dividing up and bottom by Vw.
     
  6. May 30, 2012 #5
    Re: doppler formula help please!:)

    then i would have f2*(1-Vs/Vw) which is not the same as f2/ (1-Vs/Vw) :S
     
  7. May 31, 2012 #6

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    how do you get that? :confused:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Doppler formula help please!
Loading...