Making Sound a longitudinal wave produced when matter vibrates – this in turn, causes the medium...
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Transcript of Making Sound a longitudinal wave produced when matter vibrates – this in turn, causes the medium...
![Page 1: Making Sound a longitudinal wave produced when matter vibrates – this in turn, causes the medium in which it is in to vibrate ex: tuning fork (the matter)](https://reader036.fdocuments.in/reader036/viewer/2022081603/56649ef55503460f94c09204/html5/thumbnails/1.jpg)
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Making Sound• a longitudinal wave
• produced when matter vibrates
– this in turn, causes the medium in which it is in to vibrate
• ex: tuning fork (the matter)
vibrates so the air (the medium)
vibrates
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Speed of Sound• At room temp., travels 760 mph
• How fast sound travels is determined by Temperature, Elasticity, and Density of the medium it travels through.
– the higher the temperature the faster sound travels because particles can move faster
– the more elastic the material, the faster sound travels
– density varies, but often travels faster in denser materials
– breaking the speed of sound in air creates a sonic boom
![Page 4: Making Sound a longitudinal wave produced when matter vibrates – this in turn, causes the medium in which it is in to vibrate ex: tuning fork (the matter)](https://reader036.fdocuments.in/reader036/viewer/2022081603/56649ef55503460f94c09204/html5/thumbnails/4.jpg)
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Properties of Sound1. Pitch
– depends on the frequency of the wave
• high frequency = high pitch
• low frequency = low pitch
– Humans can hear sound from 20 Hz to 20,000 Hz.
– Ultrasonic waves are above 20,000 Hz
• dog whistle
– Infrasonic waves are below 20 Hz
• moving your hand
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Range of frequencies or pitches that humans and various animals can hear
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• Doppler Effect
– a change in pitch because there is motion between the sound and the person listening to it• moving towards you = higher pitch because
waves are being compressed• moving away from you = lower pitch because
waves are being spread out
Doppler Effect Animation
Horn Sound
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2. Intensity– amount of energy carried by the wave– the greater the compression (amplitude) the
louder the sound– unit of measurement is the decibel (dB)
• every 10 decibels is about twice as loud• over 100 dB could start to damage hearing
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