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That refers to the energy transported by a sound wave. This can be described as that part of the kinetic energy of the particles, or alternately pressure differences, that is transmitted as a sound.
Gerardo Glover
Wiki User
∙ 6y agoSound waves have energy. The energy in a sound wave is both kinetic and potential energy.
Read below for the details.
This answer refers to the simplest form of sound, sound in air. There is also sound in liquid and solid materials where the details get more complicated.
Sound is vibration in air, regions of air being compressed and rarefied as the sound wave propagates. Just as in a vibrating spring, the medium has mass and moves and so moving mass is kinetic energy. Just as in the spring there is compression and rarefaction, so there is elastic potential energy. It takes energy to create the compressed regions and they the compressed regions return that energy when they expand. In fact, one can show that these two are equal in a sound wave, potential energy = kinetic energy, just like a spring.
Just like in a vibrating spring, the total energy is constant and equal to the average kinetic energy plus the average potential energy.
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