Entry Test MCQ :: Atomic Spectra

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X-rays are diffracted by a crystal but not by a diffraction grating because

[A].	The ions in a crystal are well arranged.	[B].	The lines in a diffraction grating cannot reflect X-rays.
[C].	The penetration power of X-rays is high in a diffraction grating.	[D].	The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal

Answer: Option D