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Explain why, the ceilings of concert hal...

Explain why, the ceilings of concert halls are curved.

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(i) These are basically curved surfaces (concave), which are used in auditoria and halls to improve the quality of sound. This board is placed such that the speaker is at the focus of the concave surface.
(ii) The sound of the speaker is reflected towards the audience thus improving the quality of sound heard by the audience.
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