Solid state physics

  • Thread starter kel
  • Start date
  • #1
kel
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Homework Statement



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

Homework 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


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

Thanks
Kel
 

Answers and Replies

  • #2
Kurdt
Staff Emeritus
Science Advisor
Gold Member
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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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