Amplitude And Intensity - Discovery Of Sound In The Sea

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How do you characterize sounds?
Amplitude and Intensity

Amplitude and IntensityHolly Morin2022-04-18T22:45:17-05:00 Amplitude and Intensity

A sound wave’s amplitude relates to the change in pressure caused by the wave measured at a specific location. 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. Amplitude and intensity are related, but not the same. The intensity of a sound wave is defined as the energy transmitted through a unit area, per unit time, in the direction in which the sound wave is traveling; it is a vector quantity having both a magnitude and direction. Energy in a sound wave is comprised of both the pressure component and the particle velocity component (see Science > Advanced Topics > What is intensity?). Sounds with higher intensities are perceived to be louder. Relative sound intensities are often given in units named decibels (dB).

Additional Links on DOSITS

Introduction to Decibels
Frequency
Wavelength
What is Intensity?

Additional Resources

Physics Classroom – Sound Properties and Their Perception.

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Amplitude And Intensity - Discovery Of Sound In The Sea

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