Refraction (sound) Refraction (sound) Refraction, in acoustics, comparable to the refraction of electromagnetic radiation, is the bending of sound propagation trajectories (rays) in inhomogeneous elastic media (gases, liquids, and solids) in which the wave velocity is a function of spatial coordinates. Bending of acoustic rays in layered inhomogeneous media occurs towards a layer with a smaller sound velocity. This effect is responsible for guided propagation of sound waves over long distances in the ocean and in the atmosphere. In the atmosphere, vertical gradients of wind speed and temperature lead to refraction. The wind speed is usually increasing with height, which leads to
I Changed a Lot I Changed a Lot I Changed a Lot is the eighth studio album by DJ Khaled. It was released on October 23, 2015, by We the Best Music Group and RED Distribution. Recording sessions took place during 2014 to 2015, with its production by Khaled, along with The Beat Bully, Lee on the Beats, Danja, Bkorn and The Mekanics, as well as guest appearances from Future, Rick Ross, Boosie Badazz, Jeezy, Chris Brown, August Alsina, Fetty Wap, Yo Gotti, Trick Daddy, French Montana, Meek Mill, Beanie Sigel, Jadakiss, Lil Wayne, Big Sean. Trey Songz, Jeremih, Ace Hood, Vado, Jay-Z, Mavado,