Enrichment Activity 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.