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Waves and sounds question help

  1. Hi, im having alot of trouble with 2 questions for my physics class.Waves and sound are my weakest points and always struggle to complete a full question the first one is:

    1)Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.74m from the grating.
    In the first-order spectrum, maxima for two different wavelengths are separated on the screen by 3.22 . What is the difference between these wavelengths?

    2)The frequency of the note Fsub4 is fsub F/.
    At what air temperature will the frequency be ?

    All help would be greatly appreciated. Thanks
     
  2. jcsd
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