Making Ripples in Your Lecture Just Got Easier

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 Mini Ripple Tank (PA-8638) 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.Waves are generated in a small, rectangular tank which is placed on a raised, transparent shelf over the internal illumination source. The wave generator is built onto the body of the unit and has an electronic drive circuit to vary the frequency which can also be synchronized to the light source. Dippers can be plugged into the generator by simply pushing them into the stem. A hinged, semi-opaque screen is situated above the tank and images of the wave are projected onto this for study. When access to the tank is required the screen lifts up out of the way. The sides of the tank are designed to absorb waves thus avoiding multiple reflections which cause confused patterns.


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.


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.


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


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 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.

Check Out These Cool Tools!

Mini Ripple Tank

Mini Ripple Tank
The Mini Ripple Tank creates Reflected, Diffracted, Refracted, and Interference waves with no fuss! It is compact and easy to use; don’t be afraid to let students experiment in groups and see for themselves.
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Physics Flex Cam

Physics Flex Cam
The Physics Flex Cam can easily show waves
or whatever you want to a Lecture Hall or large Classroom. You can also capture to upload or stream to the web.
1280 x 960 SXGA resolution.
Learn More




The Original Ripple Tank

Ripple Tank
The Ripple Tank is the original way to demonstrate wave phenomena in the classroom without an an overhead projector.
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Overhead Projector Ripple Tank

Overhead Ripple Tank
The Overhead Projector Ripple Tank is great for teachers
on a budget. Just use your overhead projector with this
tank and wave generator.
Learn More