The Decibel Level D of a Sound Is Related to Its

question 381

Multiple Choice

The decibel level D of a sound is related to its intensity I by $\mathrm { D } = 10 \log \left( \frac { \mathrm { I } } { \mathrm { I } _ { 0 } } \right)$ . If $\mathrm { I } _ { 0 }$ is $10 ^ { - 12 }$ , then what is the intensity of a noise measured at 93 decibels? Express your answer in scientific notation, rounding to three significant digits, if necessary.

• A) \(9.3 \times 10 ^ { - 10 } \mathrm { watt } / \mathrm { m } ^ { 2 }\)
• B) \(2 \times 10 ^ { - 3 } \mathrm { watt } / \mathrm { m } ^ { 2 }\)
• C) \(1.09 \times 1016 _ { \mathrm { watt } } / \mathrm { m } ^ { 2 }\)
• D) \(2 \times 10 ^ { - 2 } \mathrm { watt } / \mathrm { m } ^ { 2 }\)

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