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If the intensity level at distance d of one trombone is 70 dB, what is the intensity level of 76 identical trombones. all at distance

If the intensity level at distance d of one trombone is 70 dB, what is the intensity level of 76 identical trombones. all at distance d ? 5320 dB 82 dB 76 dB ' 89 dB 146 dB

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