Sound energy is a form of mechanical energy that results from the vibration of particles in a medium, typically air. It is produced by a vibrating source and travels through a medium in the form of waves.
The unit of sound energy is Joule (J).
If a loudspeaker emits sound waves with an energy of 1 joule, it means that 1 joule of mechanical energy is transferred through the air as sound.
The energy (E) of a sound wave is directly proportional to the square of its amplitude (A) and the frequency (f) of the wave, expressed by the formula:
E ∝ A2⋅f
| Example | Energy (Joules) | Frequency (Hz) | Amplitude (m) |
|---|---|---|---|
| Conversation | 0.001 | 500 | 0.0002 |
| Car Horn | 0.01 | 800 | 0.0005 |
| Music (Headphones) | 0.1 | 1000 | 0.001 |
| Thunderstorm | 100 | 20 | 0.01 |
| Footsteps | 0.0001 | 5 | 0.0001 |
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