Why do you suppose we call them "cords"? Find out by building a model.
Place the rubber bands around the cup. What sounds can you now make?
Using a straw, gently blow through the straw onto the rubber bands. What happens? See if you can produce different sounds.
How do you think the sound was produced?
What are some ways that you were able to change the pitch of the sound?
Try making another model vocal cord with rubber bands of different sizes. Also try cups of different sizes. How are the sounds different.
Watch a video of vibrating vocal cords!
Sound Site ©1999 Science Museum of Minnesota