Sound Waves

function 13-1: Sound Waves -When a tune up fork is hit, the prong swings to the equaliser and the molecules atomic number 18 pressed closer together. compression-the vicinity of soaring molecular(a) density and rail line pressure -When the prong moves to the left, the molecules to the by rights broadcast apart. rarefaction- celestial sphere of low air pressure and density -As the tuning fork continues to vibrate, it sends out a series of compressions and rarefactions in tout ensemble directions like ripples in a pond. -Sound riffles are longitudinal. audible speech sound waves-what humans hear; between 20 and 20,000 Hz infrasonic-less than 20 Hz ultrasonic- high than 20,000 Hz; used to produce images inside the forcible structure because short wavelengths are easily reflected off a petty object ex.-Dolphins use short wavelengths for echolocation. -Frequency tallys pitch. Perceived majesty or humbleness of a sound depends on frequency. The higher the frequency, the higher the pitch. -Sound waves motivate faster through solids/liquids and when temperature is higher. -Sound waves travel in three dimensions and spread out spherically.

plane wave-any spherical wave far from its inception Doppler effect-frequency shift; the result of relative effort between the root of waves and an observer reflexion: ?f = (v/c)f Section 13-2: Sound Intensity and Resonance enthusiasm-amplitude of sound waves; rate at which energy is transferred through a building block area; intensity decreases as distance from the source increases -Intensity and frequency determine which sounds are audibl e. -Medium range frequencies can be percei! ve at lower intensities. Sound at low frequencies (below 50 Hz) and high frequencies (above 12,000 Hz) must relatively intense in enact to be heard. -Intensity and distance have an inverse square relationship. formula: P/4?r2 -Frequency determines pitch and intensity (amplitude) determines volume. relative intensity-relates the intensity of a given sound to the intensity at the brink of audience (decibel level); a difference...If you want to get a unspoilt essay, identify it on our website: BestEssayCheap.com

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