A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
The distance between the atoms of crystals is of the order of wavelength of X-rays. When they fall on a crystal, they are diffracted. The diffraction pattern is helpful in the study of crystal structure.
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