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The formation of ___________ takes place when the reflecting surfaces are situated at a distance greater than 17 M or so.

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The formation of ___________ takes place when the reflecting surfaces are situated at a distance greater than 17 M or so.

(a) Live spots

(b) Loudness

(c) Echoes

(d) Noise

The question was posed to me in unit test.

The doubt is from Acoustics topic in division Acoustics and Ventilation of Construction & Building Materials

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The correct choice is (c) Echoes

Easy explanation: When the reflecting surfaces are situated at a distance greater than 17 meters or so and when the shape of the Auditorium is unsuitable, the formation of echoes takes place. This defect can be removed by selecting proper shape of the Auditorium and by providing rough and porous interior surfaces to disperse the energy of a Echoes.

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