1. Sound

2. Mechanical Wave
Sound is a longitudinal mechanical wave which means it requires a medium.
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3. Definitions
Compressions
Rarefactions

4. Waveform Sound is a three-dimensional wave

5. Pitch and Sonic Range
The frequency of a sound is often referred to as its pitch.
The average human can hear sounds from 20 Hz to 20,000 Hz.

6. Loudness
The loudness of a sound is determined by the amplitude of the sound wave. This is due to the fact that the amplitude is related to the energy transmitted by the wave.

7. Intensity of Sound

8. Spherical Wave

9. Inverse Square

10. Intensity
The power is energy per time, and the energy of a wave is related to amplitude of a wave. Therefore the power and intensity are related to the amplitude of the wave.

11. Decibel Level

12. Log Scale
The decibel scale is logarithmic, which means that an increase of 10 dB is a 10 time increase in intensity.

13. Decibel Levels

14. Decibel Exposure

15. Problem
101 meters
10 dB
50 dB
If the meters are reading sound from a single source located between them, where is the source located?