Examination of standing sound waves in a gas column using a flame tube. View larger

Physics Demonstrations in Sound and Waves, Part 2

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Part 2 Covers: Nature of Sound Waves, Propagation of Sound, Transmission of Sound Through a Medium, Refraction of Sound, Interference of Sound, Diffraction of Sound, Doppler Effect.

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  • 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 2:

    Nature of Sound Waves:
    Sources and Propagation of Sound
    Propagation of Sound: Direct Measurement of the Speed of Sound in Air and Metal
    Transmission of Sound Through a Medium: Attenuation of Sound in a Vacuum
    Refraction of Sound: Carbon Dioxide Sound Lens
    Interference of Sound: Sound Divided into Two Paths of Differing Length
    Interference of Sound: Beat Phenomena
    Diffraction of Sound: Bending of Sound by an Obstacle
    Doppler Effect: Frequency Shift of Moving Sound Source