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Wavelength diagram

  1. May 27, 2013 #1

    I have to find a diagram that shows the difference in wavelength intensity between a blueshift and a redshift. I've searched for a while but all the diagrams I find are pretty awful. If anyone knows any that decent ones would you mind linking it below? All I can find is the colour spectrum but it doesn't show anything in terms of the intensity.

  2. jcsd
  3. May 27, 2013 #2


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    Staff: Mentor

    I don't think that "intensity" is the word you are looking for. A shift won't change the intensity of the light (one ray can't become four).

    A single "blue photon" carries more energy than a "red photon", maybe that is what you are thinking of?
  4. May 28, 2013 #3
    Yes that it is. Sorry for the mistake haha, I'm still new to the topic.
  5. May 28, 2013 #4


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    Staff: Mentor

    So, we've sorted that out. :wink:

    Next, are you really looking for a diagram? Maybe you mean "formula"?

    In case you are really wondering where does that extra energy come from, the extra energy carried by a blue ray which used to be a white ray? I don't know the mechanism.
  6. May 28, 2013 #5
    This sounds like you need to qualitatively diagram a red and blue shift. So the first thing you need to do is figure out what causes these shifts? Draw a source and an observer with some arbitrary wavelength of radiation emanating from the source. Now ask yourself what has to happen to cause a shift in the wavelength as seen by the observer without altering the actual wavelength of radiation coming from the source?

    I might be misunderstanding the question but that is my take on it.
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