Question

The intensity of sound is measured on the decibel scale, dB. The equation

dB 10 log I represents the decibel level, where I is the ratio of the sound to
the human hearing threshold. A noise registers a decibel level of 29. What is the
value of I? Round to the nearest whole number.

A) 42071
B) 18
C) 89
D) 794

Answer 1

Answer: D) 794

Explanation:

`10lgI=29`

Divide both parts of the equation by 10:

`lgI=2.9\\\\I=10^(2.9)\\\\I\approx794`