February 25, 2017

Homework Help: physics

Posted by nancy on Sunday, June 12, 2011 at 8:45pm.

Factory Worker A is exposed to a sound of a constant intensity of 6.30 × 10–4 W m–2 at a distance of 1.00 m from a noisy machine. The frequency of the sound is 4.00 kHz.
(a) What is the sound level in decibels (dB) of this sound?
(b) By what factor would the amplitude of this sound wave need to change to decrease the sound level by 8 dB?

I think the first answer a) is 10log(6.3*10^-4/10^-12)=88dB but i'm unsure how to answer b

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