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What is an echo?

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What is an echo? Like light, sound can be reflected from certain surfaces. Hard surfaces such as rock or the side of a building reflect sound well; as the sound bounces back you hear an echo. The delay in hearing the echo is due to the comparatively slow speed of sound.

Soft materials absorb sound and will not produce an echo. This is why recording studios are lined with felt material, which prevents any unwanted noise from interfering with the recording.

Concorde was the only supersonic airliner in commercial use. The sonic 'boom' it produced, together with noise and air pollution concerns, limited the development of such aircraft.

Tags: sound

Category: Science & Tech  - ( Science & Tech Archive)

Date Added: 13 December '11

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