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Elan Coil [88]
3 years ago
7

Find the noise level of a sound having an intensity of 1.5x10^-14W/m^2 given I0=10^12 W/m2

Physics
1 answer:
Llana [10]3 years ago
5 0

Answer:

Noise level will be -18.2 watt

So option (b) will be correct answer

Explanation:

We have given sound intensity I=1.5\times 10^{-14}w/m^2

And threshold intensity I_0=\times 10^{-12}w/m^2 ( in question it is given as 10^{12}w/m^2 but its standard value is 10^{-12}w/m^2 )

Now noise level  =10log\frac{I}{I_0}=10log\frac{1.5\times 10^{-14}}{10^{-12}}=10log0.015-18.23

So the noise level will be -18.2

So option (b) will be correct answer

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1800 to 1820 is 20 minutes.1830 to 1838 is 8 minutes.1840 to 1905 is 25 minutes.
The total time travelled is 20+8+25 = 53 minutes = 3180 seconds.
The distance between Glasgow and Edinburgh is 28 + 12 + 34 = 74 km = 74000 m.

So, the average speed is 74000m/3180s = 23.27 m/s (4 s.f.)
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Explanation:

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Now, plug this in for work: Work = Force * Distance; so, divide work by distance to get 6067.5 N.

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3 years ago
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3) A dock worker pushes a 72 kg crate up a 2.0 m high,
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Explanation:

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where F represents the force and d represents the distance moved by the object.

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Force F = mass * gravity = 72 * 9.8

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Work done = 706 * 2.0 = 1412 J.

                   

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Therefore, substituting the given values to the equation, we get

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Therefore

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8 0
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