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: Spectral lines

  1. Nov 22, 2007 #1
    1. The problem statement, all variables and given/known data

    How do you show that in spectra taken along the equator of a rotating rigid sphere the spectral lines are tilted but straight?

    2. Relevant equations

    There were no equations given in the problem, so I guess you can use whatever equations you know.

    3. The attempt at a solution

    From the Doppler equation

    [tex]\lambda[/tex]=[tex]\lambda_{0}[/tex][tex]\frac{\sqrt{1+\frac{v}{c}}}{\sqrt{1-\frac{v}{c}}}[/tex]

    you can see that you get a different result depending on if the velocity is towards us or away from us. I think this is enough to show that the lines would be tilted, but I'm not sure.
    This is as far as I've come. I don't have any idea how to do the rest.
     
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted