Click here to download the catalog as a PDF file. To view this site you need Adobe Flash Player and your browser must allow javaScripts. Go here to get the latest Flash Player. Sound & Waves Overhead Projector Ripple Tank Now you can create real moving waves that the whole class can observe. Our Overhead Projector Ripple Tank allows you to demonstrate wave propagation, reflection, refraction, diffraction and interference on a large scale. Just place the tank on the stage of your projector. Add water to the tank and position any of the reflectors or barriers. Use the manual wave generator to send visible waves toward the reflector and observe the results. See how straight and curved reflectors work. Observe how waves behave as they enter a new medium (shallow water). Test the effect of wavelength on diffraction patterns. Student groups can also experiment individually and view the waves without using projectors. Set includes 11" x 14" tank, reflectors and barriers, manual wave generator, and teacher’s guide. Projector not included. Actual projected image: A single straight wave reflects off of the parabolic barrier to show a distinct focal point. Boomwhackers — a fun way to demonstrate resonance Demonstrate open- and closed-pipe resonance with these colorful tubes. When whacked against the floor or your knee, each tube produces a clear tone. Students can even play songs! Tubes are color-coded and labeled with the musical note they produce. You’ll get an 8-tone scale with 4 “Octavator” end caps, which halve the fundamental frequency, moving the tone down one octave. Experiment and lesson ideas are included. Approximately 12" to 24" long. P7-7400 Boomwhackers $32 P7-7260 Overhead Projector Ripple Tank 6 or more $49 $45 3D Standing Wave Machine Turn out the lights for this mesmerizing interactive show. A plain white string is connected to two motors to create beautiful 3D standing waves. Everything is adjustable — Move the arms closer together, pivot the heads, tilt the light bar, increase the motor speed, or change the light pattern and flash speed! Red, green, and blue LEDs give you a whole spectrum of color options, or use your own strobe for quantitative observations. 4 AA batteries not included. Size is 20" x 9.5". P6-7800 3D Standing Wave Machine $33.95 Illustrate interference and the production of standing waves! arborsci.com Visit us online to view a video demo of the 3D Standing Wave Machine. Easy-to-use controls allow you to adjust frequency and strobe effect or preset light settings. Experience the Doppler effect firsthand! Simple but memorable demonstration of the Doppler effect. Five inch foam ball has a battery-powered buzzer inside. Start the buzzer and play catch. Throw it fast enough and students can hear the frequency shift! Attach a string to swing the ball in a circle. 9 V battery included. P7-7120 Doppler Ball $15 To order visit arborsci.com 27