Phonon is Quantum of___________?
Correct answer: B. Elastic wave
- A. Longitudinal wave
- B. Elastic wave
- C. Transverse wave
- D. Electromagnetic wave
Explanation
A phonon is the quantum of vibrational energy associated with an elastic wave or lattice vibration in a solid. It is not a photon, so it does not represent an electromagnetic wave. Students often choose transverse wave because some lattice vibrations are transverse, but phonons can represent both longitudinal and transverse modes.
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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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