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Some surprises concerning the speed at which a pulse propagates in a composite medium

It is well known that a sound pulse travels slower in a bubbly fluid than in either the air or the fluid alone. In this lecture I will demonstrate and explain this effect. Also I will show that the opposite effect can occur when electromagnetic signals propogate in a dispersive medium. The group velocity can be higher in the composite than in either of the two constituent phases.

VIGRE Steering Committee
Department of Mathematics
University of Utah
155 South 1400 East; Room 233
Salt Lake City, UT 84112
email: viscom@math.utah.edu