Sound

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GCSE Physics> Waves> Sound
Sound waves are caused by vibrations in the air. They cannot travel through vacuums. The denser the material, the faster sound can travel.

Sound waves are reflected and this is heard by us as an echo. The echo is the sound being reflected - just like light reflected from a mirror.

Ultrasound has a very high frequency and we can not hear it but bats use it to fly and it is also used to look inside the body.

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