Solve the problem.
-The level of a sound in decibels (db) is determined by the formula N = 10 · log(I × 1012) db, where I is the intensity of the sound in watts per square meter. A certain noise has an intensity of 8.49 × 10-4 watts per square
Meter. What is the sound level of this noise? (Round your answer to the nearest decibel.)
A) 89 db
B) 206 db
C) 79 db
D) 9 db

Question

Quizplus · Accepted Answer

Using the formula N = 10 · log(I × 10^12) db and substituting I = 8.49 × 10^-4, we get N = 10 · log(8.49 × 10^-4 × 10^12) = 10 · log(8.49 × 10^8). Calculating this gives a value close to 89 db when rounded to the nearest decibel.

Solve the Problem. -The Level of a Sound in Decibels (Db) Is Determined