This is a recording of a recent live teleclass I did with thousands of kids from all over the world. I’ve included it here so you can participate and learn, too!


Sound is a form of energy, and is caused by something vibrating. So what is moving to make sound energy?


Molecules. Molecules are vibrating back and forth at fairly high rates of speed, creating waves. Energy moves from place to place by waves. Sound energy moves by longitudinal waves (the waves that are like a slinky). The molecules vibrate back and forth, crashing into the molecules next to them, causing them to vibrate, and so on and so forth. All sounds come from vibrations.


Materials:


  • 1 tongue-depressor size popsicle stick
  • Three 3″ x 1/4″ rubber bands
  • 2 index cards
  • 3 feet of string (or yarn)
  • scissors
  • tape or hot glue
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Comments

6 Responses to “Special Science Teleclass: Sonic Vibrations”

  1. Aurora Lipper says:

    Yes, indeed. The molecules in humans also vibrate.

  2. Hi Aurora, everything has a natural frequency… does this include humans?

  3. You should see a video on this page. Make sure you are logged in first?

  4. tatyana_shaitanoff says:

    We don’t see the recording of the live teleclass. Please advise.

  5. Sorry about that! The index cards are for the next experiment in this section, the Buzzing Hornet! Enjoy!!

  6. eowyntilley says:

    Just wanted to note that the experiment in this video does not match the questions that are listed above. This video does not use the index cards.