Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia. One of the problems is still causing a number of questions; it is the calculation of the coefficients of reflection ...

Waves close wavesVibrations that transfer energy from place to place without the transference of matter. , including sound and light, can be reflected at the boundary between two different materials.

Whether a sound wave is reflected, refracted, or absorbed depends on the densities of the materials either side of the boundary. If the densities are very different then reflection is more likely.