See Sound Waves
We know we can hear sound made by musical instruments, radios, car horns and voices, but did you know there is also a way we can “see” sound? Sound is a vibration, or wave, that travels through the air. Sound waves are invisible to our eyes; unless we find a way to make the sound waves move something that we can see. In this activity, your child will use different noise-making objects to cause sound waves and make sand visibly move.
- Cereal bowl or small mixing bowl
- Plastic kitchen wrap (commonly known as Saran Wrap or Cling Wrap)
- 1/4 teaspoon of sand (alternatives: sugar or salt)
- Noisemaking items: options include using your voice to hum, banging a metal spoon on a metal baking pan, a noisemaker/party blower or a musical instrument
- Wrap a bowl with the plastic kitchen wrap. Be sure to create a tight cover across the top of the bowl as if you were creating a drum.
- Gently sprinkle about ¼ teaspoon of sand onto the kitchen wrap.
- Put your mouth near, but not on, the bowl. Make humming noises. Does the sand move?
- Try making noise with other items such as banging on a metal baking pan with a spoon. Remember to place the object very near to, but not touching the bowl. Does the sand move?
- Try the experiment with various noise making objects from around your house such as a noise maker/party blower or a musical instrument.
This craft comes to you from the creators of Ready Jet Go!
Iowa PBS STEAM Activities and Crafts provided by PBS KIDS Parents.