The amplitude of a wave depends on the amount of energy that it carries. A high amplitude wave carries a large amount of energy where as low amplitude wave carries a small amount of energy.
The average amount of energy passing through a unit area per unit of time in a specified direction is called the intensity of the wave.When the amplitude of the sound wave increases, the intensity of the sound also increases. Sounds with higher intensities are become louder.
Relative sound intensities are often given in units named decibels (dB). The Bel is the primary unit and a decibel is 1/10th of a Bel. The Bel is a ratio of the pressure of a sound to a reference pressure. The reference pressure in air is 20 microPascals (µPa). The reference pressure in water is 1 microPascal (1 µPa).
Intensity: The average amount of sound power (sound energy per unit time) that transmitted through a unit area in a particular direction. The unit of intensity is watts per square meter. Full Post
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