You are using a (2000 mathrm{~V}) potential difference to accelerate electrons toward a diffraction grating and produce

Question:

You are using a $2000 \mathrm{~V}$ potential difference to accelerate electrons toward a diffraction grating and produce a diffraction pattern. If you observe the first intensity peak at an angle of $2.2^{\circ}$, what is the lattice spacing of the crystal?

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