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Transcript of Sound Waves
The loudness of a sound is determined by the amplitude or height of the wave.
It is measured in decibels or dB
60 dB is conversation
45 dB and up will wake you up
90 dB and up can cause ear damage
A sound wave will spread in all directions from its source
It will bend around doors and spread out as well
If a sound wave hits a surface, it will reflect or ECHO
Pitch is a measure of how high or low a sound is.
The pitch is affected by the frequency. The more a wave repeats, the higher the sound; the less a wave repeats, the lower the sound.
It is measured in hertz.
Some sound have too high or low a frequency for the human ear to hear.
Sound as a wave
Sound is a mechanical wave. It is actually matter moving!
Sound travels as a longitudinal wave, remember, that means it compresses and expands molecules as it travels
Sound through a medium
A medium is what a wave travels through
Sound moves faster through MORE elastic mediums
Sound moves faster through LESS dense mediums
Sound moves faster through HIGHER temperature mediums
When a sound source moves it causes a change in the frequency of waves
If it is moving towards you the pitch will get higher
If it is moving away the pitch will get lower