Sketch the way in which the speed and the wavelength change as the waves move to the shallow end.Į. Send straight waves from the deep end to the shallow end. Prop up the tank so that there is a strip of “beach” with no water on it. What effect does increasing the frequency have on the wavelength? Adjust the frequency of your wave generation. The distance between the bright bars in the wave is the wavelength. ![]() Start generating straight waves at a consistent frequency. What is the shape of the reflected pulse? Generate a circular pulse with your finger centred at the focal point. Continuing to use the parabolic curve, find the point at which the straight pulses reflected by the barrier meet. Sketch your observation of the reflected waves.ĥ. With the dowel, generate straight waves towards the open side of the parabola. Draw a diagram showing the incident wavefronts and the reflected wavefronts and their directions of travel.Ĥ. How does the angle between the incident (initial) wavefronts and the barrier compare with the angle between the reflected wavefronts and the barrier? To help you judge the angles, align rulers or other straight objects with the wavefront images. Arrange the barrier so that straight waves strike it at an angle. From what point do the reflected pulses appear to be originating?ģ. How do the pulses reflect from the barrier? Sketch your observation. Produce circular wave pulses with your finger. Does the speed of the waves change after they have been reflected?Ģ. After the pulses strike the barrier, what is the new direction of the reflected pulses? What do the pulses do when they reach the barrier? With the dowel, generate straight pulses that strike the barrier head-on (wave crests should be parallel to the barrier). Draw a straight wave showing its direction of motion.ġ. Does this shape change as it travels across the tank? ![]() Generate a straight wave with the dowel by pushing it forward 1 cm with your hand. Does the speed of the pulse seem to be the same in all directions? How can you tell?Ģ. Observing the behaviour of water waves in a ripple tank will introduce you to the analysis of wave motion. Although water waves are not the simplest waves, they are familiar to everyone. Touch the surface of the water once lightly at the centre of the tank with your finger or a pencil tip. Put water in the tank to a depth of approximately 7 mm ensurng that the tank is level. Set up the tank as instructed by the teacher. ![]() If there are questions within a procedure, put the answers immediately under the corresponding sketch.ġ. (Your ripple tank is infinitely large!) Only put four diagrams per sheet of paper please. (A1, A2, B1, B2 etc.) Do not include walls. Record a detailed line drawing for each of the following procedures. Note that these questions are for a real ripple tank, and that you will have to play with the simulation to recreate the effects. Go to Waves links and use the Virtual Ripple Tank, and others to answer the following questions: All of the accessories can be stored neatly inside the unit when not in use.Use the ripple tank to investigate wave properties of wave speed, reflection and diffraction. A selection of barriers shapes and lenses are also provided to enable reflection, refraction, diffraction and interference along with the focussing properties of lenses to be demonstrated. The ripple tank is supplied with three robust dippers which can be easily adjusted to suit the depth of water being used. Frequency can be measured using the Strobe Frequency Counter. ![]() Illumination is from a high intensity built-in LED which can be automatically strobed in sync with the waves to give perfectly stationary images, or switched to allow the user independent control of the wave and strobe frequencies giving the impression of wave motion across the viewing screen. The tank is removable for ease of use and has an integral multi-faceted beach which virtually eliminates unwanted reflections. The unit is completely self-contained with the translucent viewing screen hinging away to reveal a 12cm water tank. This makes the ripple tank experiment even more convenient. The concept has been further developed to offer new features and simplicity in this MkIII design. This compact ripple tank unit provides an elegant method of demonstrating the wave phenomena of reflection, diffraction, refraction and interference with none of the setting-up problems usually associated with ripple tanks.
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