Sound emission at the loudspeaker © Siemens Stiftung 2018 CC BY-SA 4.0 international

Sound emission at the loudspeaker

Video

Video (00:11 minutes):
The visibly vibrating diaphragm in the loudspeaker obviously transmits its movement onto the air as sound waves.

English, German
Video (2.2 MByte)
2018-08-07
The principle of sound production and propagation as sound wave in the air can be recognized clearly with the example of the diaphragm of a loudspeaker. By the way, only the lowest–pitched tones are visible. With medium and high-pitched tones the movements of the diaphragm are so fast that they are invisible.

Information and ideas:
Suitable for demonstration purposes but also good for self-study on the part of the students.
Idea: show the film without sound to begin with. The students should then guess what sort of noise/sound it might be.

Relevant for teaching:
Acoustic phenomena
Sound/acoustics: parameters
Communication and understanding
Vibrations and waves
Illustration
Music; Personal, social and health education (PSHE); Physics; Technology
Grade 1 to 4; Grade 5 to 6; Grade 7 to 9; Grade 10 to 13
Elementary school; Middle/high school; Vocational training
Electroacoustics; Sound
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© Siemens Stiftung 2018
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