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Solid state physics

  1. Mar 12, 2007 #1


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    1. The problem statement, all variables and given/known data

    The element Po forms a crystal with a simple cubic structure of spacing
    (3.34A). What is the maximal wavelength of radiation that is diffracted from a powder of that crystal

    2. Relevant equations
    N/a, however I thought that it may well be something to do with the bragg equation i.e 2d sin(angle) = n*wavelength

    3. The attempt at a solution

    I had started using the bragg equation, but it's fairly obvious to see that I need to have the angle of incident/reflection also in order to find the wavelength.

    As this is the first time that I have had any experience of solid state, I'm really not quite getting it - probably just me.

    Could you suggest where I may be going wrong i.e. am I using the wrong equation for this question? and could you suggest a starting point.

    I guess that I need to use some feature of the cubic structure in order to calculate this, but I'm a bit lost. :surprised

  2. jcsd
  3. Mar 12, 2007 #2


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    Staff Emeritus
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    Gold Member

    The question asks for the maximum wavelength and so all you have to do is think of what sin theta will give you the largest value.
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