Sound foci is a defect caused by _____________ interior surfaces.(a) Convex refracting(b) Concave refracting(c) Convex reflecting(d) Concave reflectingThe question was asked in a job interview.The doubt is from Common Acoustical Defects in portion Acoustics and Ventilation of Construction & Building Materials

Sound foci is a defect caused by _____________ interior surfaces.(a) C

1.	Sound foci is a defect caused by _____________ interior surfaces.(a) Convex refracting(b) Concave refracting(c) Convex reflecting(d) Concave reflectingThe question was asked in a job interview.The doubt is from Common Acoustical Defects in portion Acoustics and Ventilation of Construction & Building Materials
Answer» Correct choice is (d) Concave reflecting Easy explanation: SOUND foci is a defect CAUSED by concave reflecting interior surfaces. It is because of the concentration of the REFLECTED sound WAVES at certain spots. This defect can be removed by avoiding curvilinear interiors.

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