Wave amplitude formula_4 described by the equation: where The units of the amplitude depend on the type of wave. Transverse mechanical waves (e.g., a wave on a string) have an amplitude expressed as a distance (e.g., meters), longitudinal mechanical waves (e.g., sound waves) use units of pressure (e.g., pascals), and electromagnetic waves (a form of transverse vacuum wave) express the amplitude in terms of its electric field (e.g., volts/meter). The wavelength formula_30 is the distance between two sequential crests or troughs (or other equivalent points), generally is measured in meters. A wavenumber formula_17, the spatial frequency of the wave in radians
The Crests charted with their first release, "Sweetest One", on Joyce Records. After recording two more singles for Joyce Records, Patricia Vandross left The Crests in 1958 to finish her education. Their next single after "16 Candles" on COED Records was "Six Nights A Week" which hit #28 on the "Billboard" Hot 100 Charts and #17 on the R&B. Their next release "Flower Of Love" was bland compared to other Crests cuts and attained only a six-week run-up to #79. From 1958 to 1960 the group was almost always on the road. In the late 1950s, The Crests performed on several national