The Decibel (DB) Is Defined as , Where P₂

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