Discussion
Assertion (A): The glassy phase in a fired ceramic can be estimated from a diffraction pattern.
Reason (R): An amorphous phase contributes a broad hump whose area is proportional to its quantity.
Answer: C
Both are true and the reason gives the method: the hump is measured against the crystalline peaks, usually with an added internal standard, which turns what looks like background into a measurement. The method needs care but is well established.
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