In a unit cell of a crystal lattice the angle beta is between faces:
Correct answer: C. c and a
- A. a and b
- B. b and c
- C. c and a
- D. Not specified
Explanation
By convention the three interfacial angles of a unit cell are alpha between the b and c axes, beta between c and a, and gamma between a and b, each angle being named after the axis it does not lie against. Together with the three edge lengths, these six parameters define the cell completely. The Greek letter did not print cleanly in the original paper, appearing there as a stray character.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Crystal Lattice
A crystal lattice is the regular three-dimensional arrangement of particles in a crystalline solid. The content includes lattice points, unit cells, coordination number, packing patterns, and the differences among ionic, metallic, molecular and covalent network crystals, which should not be confused with amorphous solids.
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