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Consider the case where a noise level of (92+N*1) dBA exists for 4 minutes and is...

Consider the case where a noise level of (92+N*1) dBA exists for 4 minutes and is followed by a reduced noise level of 65 dBA and 40 dBA for 24 minutes and 12 minutes respectively. What is the equivalent continuous equal energy level for the 40-minute period? Assume a 2-minute sampling interval.

N value is 6

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