Discussion
In X-ray diffraction pattern the positions of the peaks depend on :
Answer: D
Peak positions depend on the lattice constants of the planes of the crystal.
The angle of each diffraction peak is fixed by Bragg's law, \(2d\sin\theta = n\lambda\), where d is the spacing of the lattice planes. In a cubic crystal \(d = a/\sqrt{h^{2} + k^{2} + l^{2}}\), so the positions are set by the lattice constant and the crystal structure.
The size of the crystallites affects the width of the peaks (the Scherrer formula), not their positions. The shape of the crystal and its texture (preferred orientation of grains) change the relative intensities of the peaks, again leaving their positions unchanged.
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