Secondand third-order elastic-constant data have been used to determine the Griineisen mode y (y), average-square Griineisen constant (yt), and nonlinear constant D for Cu, Ag, and Au. The attenuation suffered by longitudinal ultrasonic waves propagating in the $00) and (t10) directions and transverse waves polarized along (100) and (110), owing to the phonon viscosity and thermoelastic phenomena, have been evaluated for the three metals at 293'K. The phonon viscosity and dislocation drag along the (100) and O10) directions are also discussed.

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