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What is the Doppler?

  1. Jul 19, 2012 #1
    I know its to do with the drop of frequency when the object that is making the noise passes you, but what exactly is it? I dont know much about it.
  2. jcsd
  3. Jul 19, 2012 #2

    Doc Al

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  4. Jul 19, 2012 #3


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    not just the drop in freq, but also the increase in freq as the object is moving towards you

    Anyway reading Doc Al's link should clarify things for you

  5. Jul 19, 2012 #4


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    Does anyone know much about how atoms are effected by the Doppler effect as they move......or as something moves towards them?

    I've been trying to visualise it. Like as a photon approaches an atom, the atom seems flat to the photon. I've been thinking about electrons too.
  6. Jul 22, 2012 #5

    Simon Bridge

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    Sounds like a separate thread there krd.
    How about starting one and pinging me to reply?

    when you use length contraction - all of space gets flattened, not just objects in space.
  7. Aug 22, 2012 #6
  8. Aug 22, 2012 #7

    Simon Bridge

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    Good find alextx - wikipedia also has a bunch of them.
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