The pattern is best seen by doing one particle at a time. Students should use a particle spacing of 1 cm. A single frequency wave will appear as a sine wave in either case. By plotting the displacements of individual particles through which a wave is passing, students can develop their ideas of the underlying process of a wave. Waves may be graphed as a function of time or distance. Here is an animated gif for those who prefer to insert it into a powerpoint slideshow instead: Animation of longitudinal wave and transverse waveįor embedding into SLS or any platform that supports iframes. Student activity: Drawing longitudinal waves. You can choose to select the particle that you want to focus on by using the slider. a displacement of the particle to the right can be represented by a positive displacement value on the displacement-distance graph. The app can also be used to show how the displacement of a particle in a longitudinal wave can be mapped onto a sinusoidal function, similar to the shape of a transverse wave. NOTE: if you were able to freeze that applet I didn't try you. I modified Tom Walsh’s original GeoGebra app to add a moveable single oscillating particle for students to observe its movement along a longitudinal wave and a transverse wave. If you do a position-time graph for each point, they will look identical, but the graph of the transverse wave will be telling you how far up or down the point is displaced, while the graph of the longitudinal wave will be telling you how far left or right the point is displaced.
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