Sound Waves

subsection 13-1: Sound Waves -When a adjust fork is hit, the prong swings to the equaliser and the molecules atomic number 18 pressed closer together. compression-the section of graduate(prenominal) molecular(a) density and rail line pressure -When the prong moves to the left, the molecules to the mighty broadcast apart. rarefaction- theatre of operations of low air pressure and density -As the tuning fork continues to vibrate, it sends out a series of compressions and rarefactions in all directions like ripples in a pond. -Sound rambles are longitudinal. audible telephone waves-what humans hear; between 20 and 20,000 Hz infrasonic-less than 20 Hz ultrasonic-higher(prenominal) than 20,000 Hz; used to produce images inside the somatogenetic structure because short wavelengths are easily reflected off a petty object ex.-Dolphins use short wavelengths for echolocation. -Frequency desexs pitch. Perceived loftiness or humbleness of a sound depends on freq uency. 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 apparent motion 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 audible. -Medium range fr equencies can be perceive at lower intensit! ies. 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 earreach (decibel level); a difference...If you want to get a unspoilt essay, assure it on our website: OrderEssay.net

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