caused by mechanical vibrations
travel through liquid solid and gasses
travel fater through solids than gasses
cannot travel through a vaccum
sounds waves are longitudual
the frequency range of the normal human ear ranges from about 20Hz to about 20kHz
-only hard,flat surfaces such as flat walls and floors reflect sounds
-soft things lie carpets,curtains and furniture absorb sounds
am empty room will sound different once carpets curtains and furniture are put into it
sound waves can be refracted. refrection takes place between layers of air at different tempretures
sounds waves can also be defracted
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