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.
![### Noise Level Conversion Exercise
**Question:**
1. The warning tag on a lawn mower states that it produces noise at a level of 93 dB. What is this in watts per meter squared?
\( I = \) [ Input Field ] \( \text{W/m}^2 \)
**Explanation:**
The task involves converting a sound level given in decibels (dB) to the corresponding intensity in watts per meter squared (\(\text{W/m}^2\)).
#### Diagrams/Graphs:
There are no accompanying diagrams or graphs for this question.
**Note for Educators:**
To solve this, students can use the formula that relates sound intensity levels in decibels to intensity in watts per meter squared:
\[ L = 10 \log \left( \frac{I}{I_0} \right) \]
Where:
- \( L \) is the sound level in dB
- \( I \) is the intensity in \(\text{W/m}^2\)
- \( I_0 \) is the reference intensity, \( 10^{-12} \, \text{W/m}^2 \)
Rearranging for \( I \):
\[ I = I_0 \times 10^{\frac{L}{10}} \]
Using the given \( L = 93 \, \text{dB} \):
\[ I = 10^{-12} \times 10^{\frac{93}{10}} \, \text{W/m}^2 \]
This calculation will yield the intensity in \(\text{W/m}^2\).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff787f97c-9dc4-4f39-97ba-c4c8bbc1d69b%2F7e52a38d-1cda-49a3-8efb-f86041e839d4%2Fvhtuv6h_processed.png&w=3840&q=75)
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