Bangs and twangs: science fun with sound by Vicki Cobb

By Vicki Cobb

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Summary: Text and simple experiments introduce sound, how it is carried through the air and through objects, and how we hear it.  SoundJuvenile literature.  SoundExperimentsJuvenile literature.  SoundExperiments.  Haefele, Steve, ill.  Title. 078dc21 00-022116 Text copyright © 2000 by Vicki Cobb Illustrations copyright © 2000 by Steve Haefele Packaged by Ron Buehl, Creative Interface, Inc. com Printed in Hong Kong All rights reserved 1 3 5 4 2 Page 3 1 Bang It and Twang It How many ways can you make sounds with your body without using your voice?

Since the vibrations are made by your voice, the sounds your friend hears are your words. Your walkie-talkie is also a great squawker. With your thumb and index finger grasp the dental floss next to the bottom of the cup. Lightly and quickly move your fingers along the floss as far as your arm reaches. A loud squawk should come out of the cup. Keep trying until you get a squawky walkie-talkie. This works because the wax on the dental floss makes your fingers stick briefly as they slip. As your fingers stick and slip along the floss, they set up vibrations.

Tilt the ends of the suitcase up and down. As the peas move from side to side, you'll hear the sound of waves crashing on the beach. Another seashore sound is heard when you put a seashell to your ear. The shell collects sound from the air around your ear. The sound echoes inside the shell. The echoes sound like waves at the seashore. Page 45 Blow across the top of an empty soda bottle to imitate the sound of a foghorn. Rub two sandpaper blocks together in a long-short rhythm: CHUG-chug, CHUG-chug.

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