Earthquakes spread out, so they do less damage the farther they get from the source. Sunlight, for example, can be focused to burn wood. Waves can also be concentrated or spread out. ![]() For example, the longer deep-heat ultrasound is applied, the more energy it transfers. This equation, derived from classical physics and using wave phenomena, infers that as wavelength increases, the intensity of energy provided will decrease with. The energy effects of a wave depend on time as well as amplitude. In fact, a wave’s energy is directly proportional to its amplitude squared because Because work \(W\) is related to force multiplied by distance (\(F_x\)) and energy is put into the wave by the work done to create it, the energy in a wave is related to amplitude. The larger the displacement \(x\) the larger the force \(F = kx\) needed to create it. Since amplituds of electric and magnetic waves are related by speed of light, we can write intensity also as. More quantitatively, a wave is a displacement that is resisted by a restoring force. 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. The energy of these electrons (i.e., their velocity once they leave the metal) does not depend on the light intensity, although the total number of electrons. (credit: Petty Officer 2nd Class Candice Villarreal, U.S. Thus, at twice the original distance, the intensity (power per square meter) of the light passing through a single square will be 1/4 of the original intensity. 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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