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Homework Help: Project wk:calculate width of spectral line

  1. Feb 15, 2010 #1
    1. The problem statement, all variables and given/known data

    for my solar rotation prodject i am observing the sodium doublet and seeing how much it shifts from either side of the sun to calculate the rotating speed

    i need to calculate the predicted width of one of the sodium lines, ive tried to find the width to the minima's and also tried to find the FWHM but the equations wont work

    2. Relevant equations

    line 1 = 588.997nm
    line 2 = 589.594nm
    diffraction grating angle a =20.70714degrees
    focal length ie distance from grating to CCD detector = 3.405m

    I just need help getting the width in m/nm/mm/etc... and then i can convert it to pixels on the CCD
  2. jcsd
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