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With one guitar playing, the sound pressure level at a certain place is measured to be 50dB. If another guitar joins and plays exactly as

With one guitar playing, the sound pressure level at a certain place is measured to be 50dB. If another guitar joins and plays exactly as the first, what will the sound pressure level be at the same place? A. 53dB B. 100dB C. 56dB D. 54dB

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