If the sound level one person talks is 72 dB, the sound level when all 38 people are talking will be 87.8 dB.
Sound level difference is given by the expression, [tex]\Delta L=10log n[/tex], where n is the number of people.
Therefore, the difference in sound level in the given case will be
[tex]\Delta L=10log 38[/tex]
[tex]\Delta L=15.8 dB[/tex]
The final loudness will be the resultant of the initial loudness and the difference.
Final loudness = 72 + 15.8
Final loudness = 87.8 dB
Therefore, if the sound level one person talks is 72 dB, the sound level when all 38 people are talking will be 87.8 dB.
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