Includes bibliographical references (page 46) and index.
Summary
Find out how light and sound move. Why can't astronauts hear each other in space? What is sonar? Why do cats see well in low light? Includes simple activities or experiments to try.
Contents
What are light and sound? -- How do we make sounds? -- How do we hear sounds? -- How do we use sound? -- How does light move? -- How does light help us to see? -- How do we use light? -- How can we take care of our eyes and ears?