Assertiion : `X` - rays are used for studying the structure of crystals. Reason : The distance between the atoms of crystals is of the order of wavelength of `X` - rays.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If assertion and reason both are false.

Assertiion : `X` - rays are used for studying the structure of crystal

1.	Assertiion : `X` - rays are used for studying the structure of crystals. Reason : The distance between the atoms of crystals is of the order of wavelength of `X` - rays.A. If both assertion and reason are true and reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If assertion and reason both are false.
Answer» Correct Answer - A The distancce 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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