The formation of echoes can take place when the reflecting surfaces are located at a distance greater than __________(a) 7 m(b) 10 m(c) 13 m(d) 17 mThe question was posed to me by my college professor while I was bunking the class.This interesting question is from Common Acoustical Defects in chapter Acoustics and Ventilation of Construction & Building Materials

The formation of echoes can take place when the reflecting surfaces ar

1.	The formation of echoes can take place when the reflecting surfaces are located at a distance greater than __________(a) 7 m(b) 10 m(c) 13 m(d) 17 mThe question was posed to me by my college professor while I was bunking the class.This interesting question is from Common Acoustical Defects in chapter Acoustics and Ventilation of Construction & Building Materials
Answer» Correct choice is (d) 17 m To explain: The formation of ECHOES can take place when the reflecting surfaces are LOCATED at a distance greater than 17m. This defect can be removed by making surfaces highly ABSORBENT.

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