Q.

Which of the following shapes are formed by the diffracted radiation in the powder method?

A. circular
B. spherical
C. conical
D. cubical
Answer» C. conical
Explanation: for any set of lattice phases, the diffracted radiation forms the surface of a cone. the only requirement for diffraction is that the planes be at angle Θ to the incident beam, no restriction is placed on the angular orientation of the plane about the axis of the incident beam.
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