"Based on the Bragg equation, if crystal A has larger spacing in its diffraction pattern than crystal B, what conclusion can you draw about the spacing between layers of atoms in A compared with B?"
I have been looking at this problem for quite some time now. I'm not even sure what they mean by the question. Are they referring to spots of maximum constructive interference that appear on a screen as a result of laue diffraction? If so, I am unaware of a way to relate the spacing between maxima to the spacing between atom layers (d).
I solved the problem graphically by drawing out a typical two wave source interference pattern (like two bobs dabbing on water in phase) and saw that smaller spacing between wave sources (atoms) $\iff$ larger spacing between maxima (of the same order) in the interference pattern.
I have no idea whether my answer is correct, and I am also pretty certain I am overlooking a simpler (and more correct, given the phrasing of the question) way of solving the problem. Any input is appreciated :)