Loud and quiet - Jack Challoner

The scientific concepts of loud and quiet are explained in this book which is one of a series intended to encourage children to explore the science of the world around them. The concepts are explained simply and are supported by activities on every page.;Activities are suggested using a variety of simple tests to establish the volume of sound: the tapping of a metal spoon which has been attached to a piece of string vibrates up the chord and can be heard if pressed against an ear; the vibrations of a loudspeaker can be felt on a balloon; a speed of sound test; an experiment to prove that sound only bounces off hard objects; an activity to show how ear drums vibrate; a test to show how short strings make high notes and finally an activity which proves that the amount of air forced into an empty container determines the pitch of sound.;It is hoped that these activities will explain what happens when a drum is hit, why one animal has ears on its legs, how an echo is made and what makes a rattlesnake rattle. There are "did you know" boxes on every page to test the reader's knowledge.