Question

In the powder method, in powder sample various _________ samples are also present in every possible orientation.

(a) Miller indices

(b) Lattice

(c) Unit cell

(d) Atoms

I got this question during an interview.

I want to ask this question from The X-ray Diffraction Experiment in division X-Ray Diffraction of Solid State Chemistry

Answer 1

Correct choice is (b) Lattice

Easiest explanation: Lattice planes are present in the powder sample in every possible orientation. For each set various lattice planes, therefore, at least some crystals must be oriented at the Bragg angle Θ, to the incident beam and thus diffraction occurs for these crystals and planes.