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7. A speaker produces sound with intensity level 80dB at a distance 50m. Assume it does emit isotropic sound waves and estima
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dB: 10 log (et? Lo = 1072 W/m2 80 = 10 logo ta) Intensity that damages the eas is 120 dis so 120=10 loge 12 = log (1/3) I.108

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