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Why is the ceiling and wall behind the s...

Why is the ceiling and wall behind the stage of good conference halls or concert halls made curved ?

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The ceilling of concert halls, conference halls and cinema halls are curved so that sound after reflection reaches all corners of the hall uniformly.
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NCERT EXEMPLAR-SOUND-Sound
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  5. When we change feeble sound to loud we increase its :

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  6. In the curve, half the wavelength is : .

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  8. Infrasound can be heard by :

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  10. the displacement versus time relation for a disturbance travelling wit...

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  16. For hearing the loudest ticking sound heard by the ear, find the angle...

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  18. Represent graphically by two separate diagrams in each case : (i) Tw...

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