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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 frequency shift is directly proportional to the acoustic phonon velocity, and for this reason, we shall consider below the behavior of the velocity rather than of the frequency shift.
The Young's modulus E' can be expressed as a function of the longitudinal acoustic phonon frequency f obtained by Brillouin spectroscopy:
The study is the first ever to prove that acoustic phonons -- the elemental particles that transmit both heat and sound -- have magnetic properties.