you can access all the lessons from this tutorial below. The tutorial starts with an introduction to Diffraction of Waves and is then followed with a list of the separate lessons, the tutorial is designed to be read in order but you can skip to a specific lesson or return to recover a specific physics lesson as required to build your physics knowledge of Diffraction of Waves. There are 2 lessons in this physics tutorial covering Diffraction of Waves. Diffraction determines the direction in which most sound will be radiated, an important factor for the acoustical engineers who work to make them as quiet as possible. Physics Tutorial 11.7 - Diffraction of Waves. The white region is a cross-section of the front part of an aircraft engine, the sound wave is produced by the turbofan. The animation below shows another example of diffraction. Thus, this solution for noise reduction is efficient only if the houses are located within the shadow region of the sound barrier. It is characterised by low noise levels due only to the acoustic diffracted wave. The diffraction of an acoustic wave thus differs in that propagation velocity does not vary with angle from the downstream axis, unlike the diffraction of a shock of finite strength. A shadow region is observed just behind the barrier (bottom right of the animation). Interference patterns due to the superposition of the incident wave and the diffracted wave are clearly seen just before the barrier (bottom left of the animation). The animation below illustrates how a travelling wave emitted from the upper left corner by, say, an aeroplane is diffracted by a sound barrier erected to shield homes from the traffic noise. An example of diffraction phenomena is given by the spreading of waves around an obstacle. Diffraction occurs if a wave encounters an object and if the wavelength is of the same size (or greater than) the object size. Such is the case with high frequencies with respect to the head, and thus. The spreading of waves when they pass through an opening, or around an obstacle into regions where we would not expect them, is called diffraction. DIFFRACTION SOUND PROPAGATION whereby a SOUND WAVE SOUND SHADOW behind the object.
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