Reflected Waves | Longitudinal Standing Waves

30 minutes

Physics Demonstrations in Sound & Waves is a three-part video program which presents a full range of demonstrations in the areas of sound, vibrations, and wave behaviour. The program was developed in an effort to give physics teachers a comprehensive collection of video demonstrations, supplementing the instructor’s live classroom demonstrations. Three-dimensional computer animation is used to augment many of the demonstrations, providing a graphical representation of the physical behaviour.

Program Format
Individual demonstrations are 3 to 4 minutes in length and can be quickly accessed using the program's on-screen indexing system. The indexing system allows the teacher to select a particular demonstration and show it at the appropriate time during a unit on sound and waves. The accompanying teacher’s guide gives additional data, information, and suggestions on using the demonstrations to promote further classroom discussion.

Demonstration Selection and Filming Techniques
The selection of demonstrations includes those which are difficult to perform in the classroom and those requiring apparatus not readily accessible to many physics teachers. Detailed observation of the demonstrations is accomplished through use of a filming approach which focuses solely on the apparatus, allowing the teacher to utilize the program in a way which is consistent with his or her personal instructional approach. The voice over narration eliminates the on-screen presenter and allows attention to be directed to the physical behaviour being studied.

Contents of Part 1: Mechanical Resonance: Forced Vibrations with Single and Coupled Oscillators, Velocity/Wavelength & Frequency/Reflected Waves: Transverse Waves on a Coil Spring, Change in Medium/Interference: Transverse Waves on a Coil Spring, Standing Waves: Vibrational Modes on a String, Longitudinal Waves: Propagation/Interference of Longitudinal Waves, Longitudinal Standing Waves: Stroboscopic Analysis of Standing Wave Behaviour, Waves in Two-Dimensions: Reflection and Refraction of Waves in a Ripple Tank, Waves in Two-Dimensions: Interference and Diffraction of Waves in a Ripple Tank