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Some surprises concerning the speed at which a pulse propagates in a composite mediumIt 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. |
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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 |