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.
Acoustic hearing loss, also known as acoustic trauma, is a common cause of sensory hearing loss. It occurs when a loud noise damages the hearing mechanisms in the inner ear. It typically occurs in only one ear, though repeated exposure to loud noises can result in both ears being damaged.he symptoms of acoustic hearing loss can be partial or full loss of hearing or an incessant ringing in the ears, also known as tinnitus. People suffering from acoustic trauma often report a feeling of fullness in the ear, causing sounds to seem muffled.