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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?

A

`60dB`

B

`69dB`

C

`74dB`

D

`81dB`

Text Solution

Verified by Experts

The correct Answer is:
B
Let intensity due to a single person `=I`
then `10log I//I_0=60`
Also, intensity due to 8 person `=8I`
final decibel level
`=10log.((8I)/(I_0))=10(log.(I)/(I_0)+log8)`
`=60+10log8=60+30log2=60+30(.3010)`
`=69dB`
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