If the intensity of sound produced by one singer is I, then the intensity of sound of 43 singers is 43I. In decibels, this intensity will be equal to:
"X=10\\log_{10}40 +10\\log_{10}\\frac{I}{I_0}=10\\log_{10}40 +X_0"
"X=10\\log_{10}40 +84.2=100.2\\ dB"
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