When you make a sound, invisible sound waves spread out in all directions. If the sound?waves meet a hard surface like a cave ceiling or wall, they bounce back, and some sound reaches your ears. What you hear is a copy of the sound you made, only fainter.
Answers
John
When you make a sound, invisible sound waves spread out in all directions. If the sound?waves meet a hard surface like a cave ceiling or wall, they bounce back, and some sound reaches your ears. What you hear is a copy of the sound you made, only fainter.