📚 Topic Summary
Echoes happen when a sound wave bounces off a surface and returns to your ear. This reflection of sound is similar to how a mirror reflects light. The time it takes for the echo to return depends on the distance to the reflecting surface; the further away the surface, the longer the delay. Understanding echoes helps us in various applications, from sonar in submarines to medical imaging.
🔑 Part A: Vocabulary
Match the term with its correct definition:
| Term |
Definition |
| 1. Echo |
A. The distance sound travels in one second. |
| 2. Reflection |
B. A device that uses sound waves to detect objects underwater. |
| 3. Speed of Sound |
C. The bouncing back of a wave from a surface. |
| 4. Sonar |
D. A reflected sound wave. |
| 5. Sound Wave |
E. A pressure wave that travels through a medium. |
✍️ Part B: Fill in the Blanks
Complete the following paragraph using the words: distance, time, sound, echo, reflects.
An ______ is a reflected ______ wave. The ______ it takes for an echo to return depends on the ______ to the reflecting surface. A hard surface usually ______ sound waves better than a soft surface.
🤔 Part C: Critical Thinking
Imagine you are in a large canyon. You shout, and you hear an echo. What factors might affect the clarity and loudness of the echo you hear? Explain your answer.