Sound Waves.

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Presentation transcript:

Sound Waves

Sound Wave Sound wave: https://www.youtube.com/watch?v=UgE2GIQwUCw

Sound Waves Sound is a longitudinal wave produced by the vibration of an object and transmitted to the object’s environment

Sound Waves Anything that creates sound produces a longitudinal mechanical wave: loudspeakers, musical instruments and thunder cause the air particles around them to vibrate

Speed of Sound The speed at which sound travels changes from one medium to another The most common reference point is the speed of sound in air: 340 m/s Sound travels faster in liquid or solid medium- example: water = 1490 m/s, steel = 5200 m/s

Sound Wave https://www.youtube.com/watch?v=a9Jli0D1uEM Sonic boom: https://www.youtube.com/watch?v=x6DUbxCpszU Mach 1 = Speed of Sound Mach 2 = 2x speed of sound

Concorde 1976-2003 London to NYC average: 7-8 hours Concorde: 3.5 hours

Decibel Scale The volume of a sound depends on its intensity (wave amplitude), which is the amount of energy being transmitted The greater the energy, the louder the sound The decibel scale is a relative scale that represents the perception of the intensity of sound by the human ear

Decibel Scale Variations on the decibel scale are measured in factors of 10 For each increase of 10 dB, a sound is 10 times louder (Example: a sound that is 20 dB is 100 times louder than a 0 dB sound)