Question

Which of the following rays are used in the powder method of crystals?

(a) Gamma rays

(b) α-rays

(c) β-rays

(d) Monochromatic X-rays

I have been asked this question in a dream while sleeping

I'm obligated to ask this question of The X-ray Diffraction Experiment in division X-Ray Diffraction of Solid State Chemistry

Answer 1

Right choice is (d) Monochromatic X-rays

For explanation I would say: A monochromatic beam of X-rays strike a finely powdered sample that ideally has crystals randomly arranged in every possible orientation in the powder method.