Use the Formula $\mathrm { D } = 10.0 \log ( \mathrm { S } / \mathrm { S } 0 )$

question 207

Multiple Choice

Use the formula $\mathrm { D } = 10.0 \log ( \mathrm { S } / \mathrm { S } 0 )$ where the loudness of a sound in decibels is determined by S, the number of
$\text { watt/m² }$ produced by the soundwave, and $\mathrm { S } _ { 0 } = 1.00 \times 10 ^ { - 12 } \mathrm { watt } / \mathrm { m } ^ { 2 }$ What is the intensity in $\text { watt/m² }$ of a
noise measured at 40 decibels? (Round to the nearest tenth.)

• A) \(1.0 \times 10 ^ { - 7 } \mathrm { watt } / \mathrm { m } ^ { 2 }\)
• B) \(4 \times 10 ^ { - 10 } \mathrm { watt } / \mathrm { m } ^ { 2 }\)
• C) \(1.0 \times 10 ^ { - 8 } \text { watt } / \mathrm { m } ^ { 2 }\)
• D) \(5.5 \times 10^{13} \mathrm { watt } / \mathrm { m } ^ { 2 }\)

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