1. In which material does sound travel fastest?

2. Which of the following greatly affects the sound in the air?

3. In which material does sound travel slowest?

4. What property of sound is observed in an open field concert?

5. How does temperature affect the speed of sound?

6. What do you call the separation of light into its component colors?

7. Why is that, during a thunderstorm, the flash of lightning is seen before the thunderclap is heard?