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Which is the MOST accurate statement about sound?
1. A sound of 50 dB is twice as long as a sound of 25 dB
2. A desirable goal of acoustic design is to eliminate all background noise
3. A reduction of 7 dB of the noise within a room would be clearly noticeable
4. A good acoustic material absorbs all frequencies equally
3 is correct
Any change above 5 dB is clearly noticeable
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