PHYS 1070 Lecture Notes - Lecture 2: Fundamental Frequency, Sine Wave, String Instrument
9 Aug 2018
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Document Summary
Particles oscillate about an equilibrium point as the wave moves forward. Transverse: if movement of oscillating particles/cields is perpendicular to the direction of wave propagation e. g. water, string. electromagnetic cield. Longitudinal: if movement of oscillating particles/cields is parallel to the direction of wave propagation e. g. sound, slinky, seismic. It is a wave of molecular displacements within regions of high pressure/high density (compressions) and low pressure/low density (rarefactions) Longitudinal wave through v = sound velocity, determined by the medium sound is traveling f = frequency, depends on the source. = wavelength of oscillation, is determined ( = v / f ) v = f . Easier to transmit vibrations in dense medium. Water: 1550 m/s (know that this is different from water but don"t need to memorize) What are the corresponding wavelengths? v = f f = 20 hz. = v / f = 340 /30 = 17 m f = 20 khz.
