![]() The first example that comes to mind when most people hear the word wave are the kinds of waves that one sees on the surface of a body of water: deep water waves in the ocean or ripples in a puddle. Let's list a few key examples of wave phenomena and then connect them to this definition. Media is the plural form (although mediums is prefered by some people). Transmission lines are the medium of alternating current electric power. Cell membranes are the medium of nerve impulses. The Earth is the medium of seismic waves (earthquake waves). The electric and magnetic fields are the medium of light. Air is the medium through which we hear sound waves.
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