The shading is proportional to intensity. These stereo speakers produce both constructive interference and destructive interference in the room, a property common to the superposition of all types of waves. ![]() We will pursue interference patterns elsewhere in this text. Figure 2 shows what this interference might look like. ![]() The larger the displacement\boldsymbol,other places where the intensity is zero, and others in between. In the SI system, it has units watts per square metre (W/m ), or kgs in base units. More quantitatively, a wave is a displacement that is resisted by a restoring force. In physics, the intensity or flux of radiant energy is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy. Large ocean breakers churn up the shore more than small ones. Loud sounds have higher pressure amplitudes and come from larger-amplitude source vibrations than soft sounds. Large-amplitude earthquakes produce large ground displacements. The amount of energy in a wave is related to its amplitude. Ultrasound is used for deep-heat treatment of muscle strains. Loud sounds pulverize nerve cells in the inner ear, causing permanent hearing loss. Earthquakes can shake whole cities to the ground, performing the work of thousands of wrecking balls. The energy of some waves can be directly observed. (credit: Petty Officer 2nd Class Candice Villarreal, U.S. The Richter scale rating of earthquakes is related to both their amplitude and the energy they carry. ![]() The destructive effect of an earthquake is palpable evidence of the energy carried in these waves.
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