Answers are grounded in this paper and cite their sources.
Our numerical computation of precursors shows that damping increases the speed of frequency components to a degree that is consistent with energy velocity. The speedup here is slight, and a medium that has been called highly absorptive exhibits no speedup. These small effects lead us to question the extent to which energy velocity would be more useful than group velocity in the laboratory. We also introduce an especially simple method for measuring permittivity. The method is useful when damping affects wave speed no more than slightly, as happens in all the numerical simulations cited or reported here.
No takes yet. Share an insight, caveat, or question.
Roberts et al. (1992) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: