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 noiseI got this question in my homework.I want to ask this question from Acoustics in portion Acoustics and Ventilation of Construction & Building Materials

In case of concave reflecting interior surfaces ________ are formed wh

1.	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 noiseI got this question in my homework.I want to ask this question from Acoustics in portion Acoustics and Ventilation of Construction & Building Materials
Answer» 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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