Sound propagation: glass pairs © Siemens Stiftung 2018 CC BY-SA 4.0 international

Sound propagation: glass pairs

Image

Graphic:
Why does a second glass connected to the first glass with a wire vibrate when we hit the first glass?

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2018-04-22
This experiment makes it clear that sound is conducted via solid bodies. The glass starts to vibrate when it is rubbed, the wire conveys the vibrations to the second glass.
It must be remembered that the vibrations of the second glass only occur if the glasses have the same pitch level when they are struck or rubbed (use water to adjust levels if necessary)!
Close observation will show that even the water in the second glass starts to vibrate.

Information and ideas:
Setting up the experiment: Two glasses are put at a small distance from each other. A knitting needle or something similar is laid over the two glasses.
Using a moist finger, rub the first glass gently along its rim. A sound is produced, and after a short time the needle begins to vibrate on the second glass as well.

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