At home for 5-11 11-14
- Level Elementary
What you need
- A teacup or mug
- A teaspoon
- Good ears
- If you tap the rim of the teacup by the handle, opposite the handle or at the two points half way round the rim, then you hear a low pitched sound
- But if you tap the rim of the teacup halfway between those points, you hear a sound that is higher in pitch
Results and Explanation
Tapping the rim causes vibrations around the cup, but at the handle the movement is always at a minimum.
So tapping at the specific points on the rim sets up vibrations with different wavelengths and you hear notes of different pitches, or frequencies.
These experiments have not been specifically safety tested for home use but we believe them to be safe if the instructions are followed. Adult supervision or direction is recommended as appropriate. All experiments are carried out at your own risk.