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!

Doppler shift source velocity components

  1. Apr 13, 2017 #1
    1. The problem statement, all variables and given/known data
    Why does a source moving perpendicular to the line between it and the observer produce no doppler effect?


    2. Relevant equations
    source-and-observer-towards-each-other.png

    3. The attempt at a solution
    I have heard the the radial velocity of the source relative to the observer must be zero but i dont understand why, if the distance between the source and the observer is increasing or decreasing , shouldn't there be a doppler effect since the wave length is changing?
     
  2. jcsd
  3. Apr 13, 2017 #2

    PeroK

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Have you tried to figure out what sort of motion that represents?
     
  4. Apr 13, 2017 #3

    scottdave

    User Avatar
    Homework Helper
    Gold Member

    Try to think of a type of motion, where one object is stationary, and the other object is always moving, yet does not get any closer or farther from the fixed point.
     
  5. Apr 14, 2017 #4
    i guess my real question is, how does the doppler effect work when the observer and source are not moving in a straight line, what do we take in as the velocity of the observer and the source in the doppler effect equation?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted