What energies are needed to observe interference maxima in a crystal?

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dswatson
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A certain crystal has a planar spacing of .25nm. What energies are necessary to observe up to three interference (diffraction) maxima for a)electrons and b)neutrons?
 
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What have you tried? What do you know about diffraction through a crystal? What equations do you know that give the interference maxima for this type of diffraction?
 

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