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melisa1 [442]
2 years ago
11

Traffic noise on Beethoven Boulevard has an intensity level of 80 dB; the traffic noise on Mozart Alley is only 60 dB. Part A Co

mpared to the sound intensity on Beethoven Boulevard, the sound intensity on Mozart Alley is Compared to the sound intensity on Beethoven Boulevard, the sound intensity on Mozart Alley is a. 25% lower.b. 100 times lower. c. 20 W/m2 lower. d. 20 times lower.
Physics
1 answer:
uranmaximum [27]2 years ago
8 0

Answer:

option (b)

Explanation:

Io = 10^-12 w/m^2

In Case I:

dB = 80 dB

The formula for the intensity of sound

dB=10log\left ( \frac{I}{I_{0}} \right )

80=10log\left ( \frac{I_{1}}{I_{0}} \right )

I_{1} = 10^{8}\times I_{0}

I_{1} = 10^{8}\times 10^{-12}=10^{-4}W/m^{2}   ... (1)

In Case II:

dB = 60 dB

The formula for the intensity of sound

dB=10log\left ( \frac{I_{2}}{I_{0}} \right )

60=10log\left ( \frac{I_{2}}{I_{0}} \right )

I_{2} = 10^{6}\times I_{0}

I_{2} = 10^{6}\times 10^{-12}=10^{-6}W/m^{2}   ... (2)

So, by equation 2 and 1 we get

I_{2}=\frac{I_{1}}{100}

Thus, the intensity of sound is 100 times lower.

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Complete Question

The complete question is shown on the first uploaded image

Answer:

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Explanation:

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Generally the change in the bird temperature with time is mathematically represented as

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