The loudness of sounds is measured in a unit called a decibel. To do this, a very faint sound, called the threshold sound, is assigned an intensity I0. If a particular sound has intensity I, then the decibel rating of this louder sound isFind the decibel ratings of the following sounds having intensities as given. Round answers to the nearest whole number.
(a) Whisper, 115I0 

(b) Busy street, 9,500,000I0
(c) Heavy truck, 20 m away, 1,200,000,000I0
(d) Rock music concert, 895,000,000,000I0
(e) Jetliner at takeoff, 109,000,000,000,000I0

(f) In a noise ordinance instituted in Stamford, Connecticut, the threshold sound I0 was defined as 0.0002 microbars. Use this definition to express the sound levels in parts (c) and (d) in microbars.

Transcribed Image Text:

I 10 log- lo