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Why are the ceilings of concert halls cu...

Why are the ceilings of concert halls curved?

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Generally the ceiling of the concert halls, conference halls and cinema halls are curved so that sound after reflection reaches all corners of the hall as shown in fig. 12.28. Sometimes a curved sound board may be placed behind the stage so that sound after reflecting at the sound board spreads evenly across the width of the hall.
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NAND LAL PUBLICATION-SOUND-Intext Questions
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  15. Why are the ceilings of concert halls curved?

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