The Decibel (DB) Is Defined As $\mathrm { dB } = 10 \log \frac { P _ { 2 } } { P _ { 1 } }$

question 71

Multiple Choice

The decibel (dB) is defined as $\mathrm { dB } = 10 \log \frac { P _ { 2 } } { P _ { 1 } }$ , where P2 is the power of a particular signal and P1 is the power of some reference signal. In the case of sounds, the reference signal is a sound level that is just barely audible. How many dBs does a sound have if its power is 7,320,000 times that of the reference sound? Round to the nearest tenth.

• A)158.1 dB
• B)68.6 dB
• C)29.8 dB
• D)10.0 dB
• E)0.0 dB

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