Energy Transport Momentum

As more and more waves (of wavelength λ) are generated at the source point, previous waves keep moving forward in the medium (e.g. along the string). In unit time, v waves are produced; the energy associated with these v waves is



where, v = v λ is wave velocity. is average power, i.e. the average energy input per second by the source. This energy flows through the medium with speed v; in unit time, v waves pass through any point on the string, each carrying energy E associated with the transport of energy by a mechanical wave is also the transport of momentum. Momentum flow is related to the mechanical force that the wave exerts when it strikes an object, which may partially or totally absorb these waves or reflect them.

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