Science Tutorial: Amplitude (Intensity) 2017-11-21T13:42:35+00:00

Science Tutorial: Amplitude (Intensity)

A sound wave’s amplitude relates to changes in pressure. The sound is perceived as louder if the amplitude increases, and softer if the amplitude decreases.  This is illustrated below.

DOSITS short video on amplitude.

The amplitude of a wave is related to the amount of energy it carries. A high amplitude wave carries a large amount of energy; a 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. As the amplitude of the sound wave increases, the intensity of the sound increases. Sounds with higher intensities are perceived to be louder. Relative sound intensities are often given in units named decibels (dB).

 

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Next Section: Frequency

 

Science of Sound Tutorial Sections:

What is Sound?

Describe Sound

Amplitude (Intensity)

Frequency       

Wavelength     

Sound Speed

Sound Spreading

Sound Absorption

Sound in Air vs. Water

Sound Viewed & Analyzed

Sound Pressure Level