EOSC 114 Lecture Notes - Winter 2018 Lecture 4 - Phase velocity, Stationary point, Group velocity
20 Sep 2018
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Document Summary
Wave metrics: wave metrics refers to aspects of the wave that can be measured, to help us describe its characteristics. For longitudinal waves, the wavelength is the distance from one compressed region to the next. This is a measure of how bit a wave is: measured in distance units per each wave cycle (from crest through trough and back to crest). For example: the units are m/cycle for normal ocean waves, and k(cid:373)/(cid:272)y(cid:272)le for tsu(cid:374)a(cid:373)i. We ofte(cid:374) lea(cid:448)e out the (cid:449)ord (cid:862)(cid:272)y(cid:272)le(cid:863) a(cid:374)d just gi(cid:448)e the wavelength in distance units (m or km: amplitude: the vertical dista(cid:374)(cid:272)e fro(cid:373) a tra(cid:374)s(cid:448)erse (cid:449)a(cid:448)e"s (cid:374)or(cid:373)al rest positio(cid:374) to its crest. For sound waves, the amplitude can be measured by the amount of pressure fluctuations caused by the waves. For example, in sound waves, the wavelength determines the pitch (high note or low note), while the amplitude indicates the loudness: phase speed: how fast each wave crest or each wave trough moves.
