v. perked, perkÂ·ing, perks. v.intr. 1. To stick up or jut out: dogs' ears that perk. 2. To carry oneself in a lively and jaunty manner.
However instead of crests and troughs, longitudinal waves have compressions and rarefactions. Definition 1: Compression. A compression is a region in a longitudinal wave where the particles are closest together. A rarefaction is a region in a longitudinal wave where the particles are furthest apart. As seen in Figure 1, there are regions where the medium is compressed and other regions where the medium is spread out in a longitudinal wave. The region where the medium is compressed is known as a compression and the region where the medium is spread out is known as a rarefaction.
WHAT IS SOUND MASKING? Sound Masking is the addition of an unstructured sound to an environment that fills in the sound spectrum and makes the structured sound of human speech less intelligible. Usually itâs an unintrusive sound like airflow, similar to a typical modern HVAC system. Sound Travels.