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Related to Acoustic phonon: Optical phonon

phonon (fōˑ·nn),

n a discrete unit of sound energy that can travel through the piezoelectric medium of connective tissue.
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The Young's modulus E' can be expressed as a function of the longitudinal acoustic phonon frequency f obtained by Brillouin spectroscopy:
Inelastic light scattering from a crystal can be as an inelastic scattering of a photon from acoustic phonons.