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Elastic waves in crystals are made up of _______________

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Elastic waves in crystals are made up of _______________

(a) Photons

(b) Nano particles

(c) Atoms

(d) Phonons

This question was posed to me in an online interview.

I would like to ask this question from Quantum Nature of Elastic Waves in division Quantum Physics of Engineering Physics I

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Right answer is (d) Phonons

To explain: In a crystal, when energy is provided, the lattice absorbs energy and gets excited to a higher state. When it de-excites to ground state, it releases radiation in sound-wave region, known as phonons. These waves are quantized.

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