Civil Engineering - UPSC Civil Service Exam Questions - Discussion

25. 

Two sources generate noise levels of 90 dB and 94 dB respectively. The cumulative effect of these two noise levels on the human ear is

[A]. 184 dB
[B]. 95.5 dB
[C]. 94 dB
[D]. 92 dB

Answer: Option B

Explanation:

No answer description available for this question.

Ashish said: (Oct 29, 2019)  
L(eq) = 10log(10^(L1/10)+10^(L2/10)+.....).
L(eq) = 10log(10^(90/10)+10^(94/10)) = 95.5.

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