Vicki Cobb - Bangs and twangs: science fun with sound
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Published by The Millbrook Press, Inc. 2 Old New Milford Road Brookfield, CT 06804 www.millbrookpress.com
Library of Congress Cataloging-in-Publication Data Cobb, Vicki. Bangs and twangs : science fun with sound / Vicki Cobb; illustrated by Steve Haefele p. cm. Summary: Text and simple experiments introduce sound, how it is carried through the air and through objects, and how we hear it. ISBN 0-7613-1571-3 (lib. bdg.) 1. SoundJuvenile literature. 2. SoundExperimentsJuvenile literature. [1. SoundExperiments. 2. Experiments.] I. Haefele, Steve, ill. II. Title. QC225.5 .C63 2000 534'.078dc21 00-022116
Text copyright 2000 by Vicki Cobb Illustrations copyright 2000 by Steve Haefele Packaged by Ron Buehl, Creative Interface, Inc. Visit Vicki Cobb at www.vickicobb.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? Experiment and find out.
Cluck your tongue. Smack your lips. Make a kissing sound. Whistle. Sniff. Blow to make your lips flap. Clap your hands. Snap your fingers. Slap your thigh. Stamp your feet.
Page 4
Now go around your house making different noises. The most obvious way to make sounds is to strike things. Bang pots and pans. Gently tap a glass with a spoon. Knock on wood. Pluck a guitar or a piano string or a stretched rubber band. Blow across the open top of a soda bottle. Listen to each sound you make. Is it like a musical note or is it an ordinary
The sound waves are traveling through air.
Page 5
noise? Is it high or low? Can you match the tone with your voice? Hit something solid like countertop. Hit something hollow like a box. Knock on a wall in several places. Some areas may sound hollow, some may sound solid. The solid sound comes from places where there is a beam or stud behind the wall.
The sound waves are traveling through wood.
Page 6
A rubber band can show you what happens when a sound is made. First, hook a rubber band over a doorknob and stretch it tightly. Pluck it to create a sound. Look at it closely as it gives off its twang. Use a magnifying glass if you have one. You can see that the rubber band
Page 7
moves back and forth very quickly. This kind of motion is called a vibration. Now pull the rubber band tighter. Pluck it again. Is the sound lower or higher? Are the vibrations faster or slower? The highness or lowness of a sound is called its pitch. The faster higher the pitch.
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When you use your voice, you create vibrations. Make a humming noise your hand on your throat. Feel the vibrations of your voice box. Hum a high note and then a low note. Feel the difference.
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