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If the intensity level at distance d of one trombone is 70 dB, what is the intensity level of 40 identical trombones, all at distance

If the intensity level at distance d of one trombone is 70 dB, what is the intensity level of 40 identical trombones, all at distance d ? O 86 dB 110 dB 0 40 dB 5320 dB 74 d8

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