In this book, the authors present current research in the study of the propagation, frequency and effects of sound waves. Topics discussed include time resolved visualisation and analysis on a single short acoustic wave generation; elastic vibrations of an isotropic plate with laser-induced atomic defects; sound velocity into turbulent medium; infrasound generation by turbulent convection; neutrons diffraction in a crystal under the influence of a sound wave and the transformation of sound waves in non-stationary media.