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Sound Waves

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by

Laura Krcelic

on 1 April 2015

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Transcript of Sound Waves

Sound Waves
Sound is Produced by Vibrations
Vibration is the complete back-and-forth motion of an object
Creating Sound VS. Detecting Sound
"If a tree falls in the forest and no one is around to hear it, does the tree make a sound?"
Detecting Sound
Hearing Loss and Deafness

How the Ear Works
Properties of Sound
Sound changes when mediums change

All sounds require a medium
tinnitus:
results from long-term exposure to loud sounds
Loud sounds can cause damage to hair cells and nerve endings
Speed of Sound in Different Media
Medium Speed (m/s)
Air 343
Helium 1,005
Water 1,482
Sea Water 1,522
Wood (oak) 3,850
Glass 4,540
Steel 5,200
Pitch DEPENDS on frequency
high frequency = high pitch
low frequency = low pitch
Frequencies You Can Hear -> 20 Hz to 20,000 Hz
Frequencies we CAN'T hear ->
Lower than 20 Hz = infrasonic
Higher than 20,000 Hz = ultrasonic
Loudness is Related to Amplitude
Large Amplitude = Loud Sound
Unit of loudness is the
decibel (dB)
Full transcript