Question

A person is talking in a small room and the sound intensity level is 60 db everywhere within the room. if there are eight people talking simultaneously in the room, what is the sound intensity level ?

Answer 1

Answer:

69 Decibels

Step by step explanation:

Let I be the intensity due to one person and I' the intensity due to 8 people (I'=8*I).

Let $B_1$ the initial intensity and $B_2$ the final sound intensity.

The change in sound intensity is given by:

$B_2-B_1=10log(\frac{I'}{I})\\B_2-60=10log(\frac{8I}{I})\\B_2-60=10log(8)\\B_2=10log(8)+60\\B_2=69\:decibels$