Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
![**Sound Intensity and Decibel Levels**
An outside loudspeaker (considered a small source) emits sound waves with a power output of 104 W.
**(a)** Find the intensity 12.5 m from the source.
\[ \Box \text{ W/m}^2 \]
**(b)** Find the intensity level in decibels at that distance.
\[ \Box \text{ dB} \]
**(c)** At what distance would you experience the sound at the threshold of pain, 120 dB?
\[ \Box \text{ m} \]
**Explanation**:
This exercise involves calculating sound intensity and corresponding decibel levels. You will use the power output of the loudspeaker, the distance from the source, and the properties of sound propagation to find these values.
Ensure your calculations follow the principles of sound wave physics, especially considering how intensity decreases with distance.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F59577f62-52f2-4d8a-8fce-f8969dac81ff%2Fa2b19db7-39b0-4747-b23e-8706577cb0ae%2Ff9g81j_processed.png&w=3840&q=75)
(a)
Intensity at 12.5 m from the source is 0.053W/m2
(b)
Intensity level in decibels at this distance is 107.24 dB.
(c)
The distance at which the intensity level would be 120 dB is 2.87 m
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