The Level of Sound in Decibels (Db) Is Given by the Formula

Multiple Choice

The level of sound in decibels (db) is given by the formula , where I is the sound intensity in watts per square meter. If the sound intensity of a jet airplane is 0.001 watts per square meter at a distance of 170 meters, what is the level of the sound at this point in db, rounded to the nearest tenth?

A) 74.7
B) 77.2
C) 90.0
D) 81.1