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
60 dB
B
69 dB
C
74 dB
D
81 dB
Text Solution
Verified by Experts
The correct Answer is:
B
Let intensity due to a single person =I then `10 log I//I_(0)=60` Also, intensity due to 8 person =8L `:.` final decibal level `=10 log((8I)/(I_(0)))=10(log.(I)/(I_(0))+log8)` `=60+10 log 8=60 +30 log2=60+30(.3010)` `=69`
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