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In case of concave reflecting interior surfaces ________ are formed where reflected sound waves meet and create a sound of larger intensity.

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In case of concave reflecting interior surfaces ________ are formed where reflected sound waves meet and create a sound of larger intensity.

(a) Sound foci

(b) Dead spots

(c) Exterior noise

(d) Interior noise

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I want to ask this question from Acoustics in portion Acoustics and Ventilation of Construction & Building Materials

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The correct answer is (a) Sound foci

Easiest explanation: Sound foci is observed where reflected sound wave meet and create a sound of larger intensity. This defect can be eliminated by avoiding curvilinear interiors or by providing highly absorbent materials on the focusing areas.

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