The Decibel Level D of a Sound Is Related to Its

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) $2 \times 10 ^ { - 2 } \mathrm { watt } / \mathrm { m } ^ { 2 }$