Sounds can change as they move from one medium to another. Under the right circumstances the effect is surprising and extreme.
- Sound is a wave that is created by vibrating objects.
- Every object has a natural frequency at which it vibrates - its Resonant Frequency.
- A build-up of resonant frequency can make music or break glass.
- Sound waves can be reflected, refracted and diffracted.
Sounds can be modified in various ways owing to the nature of their waves.
An echo occurs when a sound wave hits a smooth, flat surface – such as stone – and is reflected back.
When sound waves pass through different materials – such as air or water – their speed can ...
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