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?
Type of media:
Image (43.1 kByte)
Last update:
2018-04-22
License:
This medium is made available under a CC BY-SA 4.0 international license.
What does this mean?
How to reference this medium
This medium is made available under a CC BY-SA 4.0 international license.
What does this mean?
How to reference this medium
Description:
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
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
Related media:
There are no other media directly related to this file.
Learning resource type:
Illustration
Subjects:
Personal, social and health education (PSHE)
Grade levels:
Grade 1 to 4; Grade 5 to 6; Grade 7 to 9; Grade 10 to 13
School types:
Elementary school; Middle/high school; Vocational training
Keywords:
Sound; Sound (basic phenomenon); Sound propagation
Bibliography:
Siemens Stiftung Media Portal
Author:
MediaHouse GmbH
Rights holder:
© Siemens Stiftung 2018