X-rays are diffracted by a crystal but not by a diffraction grating because_____________?
AThe penetration power of X-rays is high in a diffraction grating
BThe ions in a crystal are well arranged
CThe lines in a diffraction grating cannot reflect X-rays.
DThe wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal
Correct answer
D. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal
Explanation
The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.