In a powder diffraction pattern recorded from a face-centred cubic sample using X- rays. The first peak appears at 30°. The second peak will appear at what angle (degrees)Correct answer is '35.3'. Can you explain this answer?

Question

In a powder diffraction pattern recorded from a face-centred cubic sample using X- rays. The first peak appears at 30&deg;. The second peak will appear at what angle (degrees)Correct answer is '35.3'. Can you explain this answer?

Answer

For 2nd peak [2 0 0],

The correct answer is: 35.3

Answer

The first peak in the powder diffraction pattern of a face-centred cubic sample using X-rays appearing at 30 degrees indicates the presence of a specific crystal plane reflection. This peak corresponds to the (111) plane reflection in the face-centred cubic crystal structure. The angle at which the peak appears, in this case, is 30 degrees, which is the angle of diffraction of X-rays from the (111) plane.

Answer

Actually we get second peak for ist order n=1 then we get angle.

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