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Physical Quantities of Sound: Sound Pressure, Amplitude, Sound Power, Sound Intensity

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Physical Quantities of Sound: Sound Pressure, Amplitude, Sound Power, Sound Intensity

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Questions and Answers

According to the Inverse Square Law, how is the intensity of sound related to the distance from the source?

Proportional to the square of the distance

Inversely proportional to the distance

Inversely proportional to the square of the distance (correct)

Directly proportional to the distance

What is the formula for calculating sound intensity (I) using the given equation in the text?

I = W / A (correct)

I = W / 2πr2

I = W x 4r2

I = W / 4r

If a sound source produces an intensity of 0.003 W/m2 at 3m, what would be the intensity at 9m from the source?

0.000333 W/m2 (correct)

0.001 W/m2

0.0001 W/m2

0.009 W/m2

In the context of sound intensity level (loudness), what does 'Bel unit' represent?

Logarithmic unit for loudness Signup and view all the answers

How can the sound intensity level (LI) be calculated using the given equation in the text?

LI = log (I / I0) Signup and view all the answers

Which physical quantity is defined as the difference between the actual pressure at any point in the field of a sound wave and the static pressure at that point?

Sound Pressure Signup and view all the answers

What is the unit of Sound Pressure (P)?

Pascals Signup and view all the answers

In the context of sound, what does Sound Intensity (I) measure?

The rate at which acoustic energy flows through a unit area Signup and view all the answers

What is the formula to calculate Sound Intensity (I)?

$I = \frac{W}{A}$ Signup and view all the answers

At what distance from its source was the intensity of sound waves emitted by blue whales measured as 3.0 x 10^-3 W/m2?

4.0 m Signup and view all the answers

What is the threshold of audibility for sound intensity, as determined in the context of this text?

$10^{-12}$ W/m2 Signup and view all the answers