Posted by **jj** on Saturday, October 9, 2010 at 9:24pm.

The decibel (dB) is defined as

dB= 10log (P2/P1), where P2 is the power of a particular signal. 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 665,000 times that of the

reference sound? Round to the nearest tenth.

A) 134.1 dB

B) 58.2 dB

C) 25.3 dB

D) 10.0 dB

E) 0.0 dB

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