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
Sound of a Living Heart Sound of a Living Heart Sound of a Living Heart is tenth studio album by JJ Heller. Stone Table Records alongside Sparrow Records released the album on August 21, 2015. Kevin Sparkman, indicating in a three and a half star review for "CCM Magazine", describes, "Heller continues her proven formula of innocent melodies, heart moving lyrics, and inviting musical moments." Awarding the album four stars from Jesus Freak Hideout, Mark D. Geil states, ""Sound of a Living Heart" is an encouraging sign of a continued upward trajectory." Jay Heilman, reviewing the album for Christian Music Review, writes, he's "highly impressed..."Sound