Report copyright - L23 Noise pollution - ocw.snu.ac.kr · •Sound power level: 12ref = 10‐ W •Sound intensity level: 12ref = 10‐ W/m2 . Â10 H K C 5 4 + 10 ? 5 6 . ê10 H K C 5 4 9 10 ? 5 6 •Sound
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