Concept explainers
(a)
Find the decibel level of thunder.
(a)
Answer to Problem 43WE
120 dB
Explanation of Solution
Given:
The formula
The intensity of thunder is
Calculation:
Since the intensity of thunder is
Let
So,
So, the decibel level of thunder is :
So, the decibel level of thunder is 120 dB.
(b)
Find that how many times as intense as normal conversation is the noise of the subway train.
(b)
Answer to Problem 43WE
10,000
Explanation of Solution
Given:
The formula
The decibel levels of a subway train entering a station and normal conversation are 100 dB and 60 dB respectively.
Calculation:
Let
Consider ,
So, the noise of the subway train is 10,000 times as intense as the normal conversation.
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Algebra and Trigonometry: Structure and Method, Book 2
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