(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Consider a crystal with planar spacing 3.2 A^{0}. What order of magnitude of energies would

one need for (a) electrons, (b) helium nuclei (mass = 4*proton mass) to observe up to three

interference maxima?

2. Relevant equations

2d.sinx = n.lambda (I)

lambda = h / p (II)

E = (1/2)mv2^{2}

3. The attempt at a solution

To solve this question, I thought I must first find the wavelength and can use other equetions that I wrote above. Actually, I don't know how I can use them but since in the question, mass is important, I thought an equation with mass can work.

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# Homework Help: Magnitude of the energy for interference maxima

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