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Homework Help: Find the wavelength in the lab of grating spectrometer?

  1. Mar 30, 2010 #1
    I did a lab today using this stuff. I need to learn how to find the wavelength of the 1st order of an unknown filament. My data is
    600 lines/mm grating
    Purple line
    15 degrees 30 minutes, 15.5 degrees

    using the equation of d sin (angle) = m (lambda)

    im supposed to get something like 444nm or 436nm.

    i rearranged the equation as d sin (angle)/m = lambda

    im definately doing something wrong
  2. jcsd
  3. Apr 2, 2010 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Everything looks okay so far. How about doing--and showing us--your calculation?
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