Making Ripples in Your Lecture Just Got Easier


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Every once in a while we come across something that has the chance to make a real difference in the classroom in both engaging the students and making your life as a professor a little easier. We think this may be one of those times. Ripple tanks are such a wonderful way to teach your students about the concepts behind waves, but they can be time consuming to set up and take down. The new  addresses these issues by providing a completely self contained device, requiring no setup apart from the addition of water. The tank has settings that allow you to adjust the frequency of the wave and light and show everything from perfectly static to rapid wave patterns. It can be used for a small group demonstration, such as a lab, or in combination with the Physics Flex Cam for larger lecture hall settings.

Investigations

The various accessories allow different wave effects to be studied. Strobe illumination gives the best results at all frequencies. Higher frequencies give shorter wavelengths with the waves closer together. Since the patterns are stationary a sheet of tracing paper or OHP film can be placed on the viewing screen and drawings made for subsequent analysis.

Reflection

Observe the incident and reflected wave directions from plane waves. Vary the plate angle to see the effect. Circular waves and the reflection of these can also be studied.

Diffraction

Plane wave diffract around and behind the plate. If two plates are used with a narrow gap between them, circular waves can be seen.

Interference

Use the twin point dipper with nothing else in the tank. Constructive and destructive interference will be seen where the two sets of circular waves meet.

Refraction

Refraction relies on the different speeds of water waves in different depths of water. As the waves slow down in the shallow water they bend round slightly towards the normal. With a single point dipper, the distortion of the circular wave pattern is very obvious. With a convex lens shape the plane waves create a focusing effect. With a concave shape and plane waves there is a divergence of the waves as they pass over the shape.


Collin Wassilak

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