Question

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

Answer 1

Hii dear,

# Answer- 69 decibel

# Explaination-

Initial sound intensity level B1=60 decibel

Let I be the intensity due to 1 person.

Due to 8 persons sound intensity I' = 8I

Change in sound intensity level is given by,

B2-B1 = 10log(I'/I)

B2-60 = 10log(8I/I)

B2-60 = 10log(2^3)

B2-60 = 10×3×log2

B2-60 = 10×3×0.3

B2 = 60+9

B2 = 69 decibel

Sound intensity level due to 8 persons is 69 decibel.

Hope this is useful...