Abstract
The question of the magnitude of the momentum remains open even for a light wave propagating in matter. In accordance with Minkowski, the momentum of light in matter increases by n times as compared with that in vacuum. On the contrary, in accordance with Abraham, the momentum of light in matter decreases by n times, but in the same time an additional force arises. At present there is no generally accepted notion about a magnitude of the momentum of a light wave. Moreover, if Abraham is right, an additional type of force exists in nature. Based on thought experiments where only laws of mechanics are used, we show that the Abraham force exists and shows itself not only at an interaction between light and matter but also at an interaction between matter and any wave propagating in matter. An experimental confirmation of an existence of the Abraham force produced by a sound wave propagating in gases or liquids is presented.
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