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Homework Help: Diffraction of X rays

  1. Sep 26, 2008 #1
    Diffraction of X rays has been observed when a beam strikes an extremely fine slit. What must be the width if the slit if X rays of wavelength 10A are to display a diffraction pattern with a central beam of angular width 0.1?

    I used Bragg's equation to obtain:
    d=1*10A/2sin(0.1)=2864.8A= 246.48nm?

    Is this correct?
  2. jcsd
  3. Sep 26, 2008 #2


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    Hi Quelsita,

    I don't believe you are using the correct equation here. Bragg's law describes diffraction by a crystal; here the process is single slit diffraction. What equation would describe that?
  4. Sep 26, 2008 #3
    Could you use the grating equation d[sin(thetam)+sin(thetai)]=m(lambda)?
    But what is thetamax?
  5. Sep 26, 2008 #4


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    I think you should use the single slit diffraction equation. The equation for the minima is

    a\ \sin\theta =m\lambda

    I would think that your book has at least a section on single slit diffraction, so it can tell you how to apply this to your problem. What do you get?
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