The Decibel (DB) Is Defined as , Where P₂

question 35

Multiple Choice

The decibel (dB) is defined as , 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 5500 times that of the reference sound? Round to the nearest tenth.

• A) 86.1 dB
• B) 37.4 dB
• C) 16.2 dB
• D) 10.0 dB
• E) 0.0 dB

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