Negative refraction of elastic waves has been studied and experimentally demonstrated in three- and two-dimensional phononic crystals, but Bragg scattering is impractical for low-frequency wave ...

sound waves cause air particles to vibrate back and forth; ripples cause water particles to vibrate up and down. A longitudinal wave is one in which the vibrations of the particles are parallel to the ...

Types of Waves: In Physics, waves are a fundamental phenomena that describes the transmission of energy and information through a medium of an empty space. These waves are characterised by their ...