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During class, two cell phones go off at the same time (Oops!). Assume each phone produces...

During class, two cell phones go off at the same time (Oops!). Assume each phone produces an amplitude of 75 dB SPL and the sounds are in phase. What is their combined level?

Less than 75 dB SPL

Between 75 and 79 dB SPL

Between 80 and 85 dB SPL

Between 145 and 155 dB SPL

Greater than 155 dB SPL

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