<ul><li>The speed of sound waves depends on 2 things. </li></ul><ul><li>Type of medium- liquids and solids make better conductors. </li></ul><ul><li>Temperature of medium- as temperature increases, the molecules move faster so the waves move faster. </li></ul>
<ul><li>Pitch - the highness or lowness of a sound. </li></ul><ul><li>High pitch = high frequency </li></ul><ul><li>Low pitch = low frequency </li></ul>
<ul><li>Intensity - the amount of energy in each wave. Intensity increases as amplitude increases….which also makes the sound louder. </li></ul><ul><li>- The intensity of sound is measured in decibels (dB) </li></ul>
Jet takeoff (25 M) 150 Eardrum rupture Aircraft carrier deck 140 Earphones at high level Jet takeoff (100 M) 130 Thunder, live rock music 120 Human pain threshold Chain Saw, auto horn 110 Lawn mower, farm tractor 100 Serious hearing damage Busy street, diesel truck, 90 Hearing damage Garbage disposal, factory 80 Possible hearing damage Freeway traffic, vacuum 70 Annoying Conversation in restaurant, 60 Conversation at home 50 Quiet Library 40 Quiet rural area 30 Whisper, rustling leaves 20 Very Quiet Breathing 10 0 Threshold of hearing
<ul><li>Resonance- the tendency of an object to vibrate at the same frequency as another vibrating source. </li></ul><ul><li>Reverberation - echoing effect produced by multiple reflections of sound. </li></ul>
<ul><li>Interference - the ability for 2 or more waves to combine and form a new wave. </li></ul>
<ul><li>Diffraction - the bending of waves around a barrier. </li></ul>
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