An echo is produced due to the __________ .

Options

A. Multiplication of sound waves
B. modification of sound waves
C. reflection of sound waves
D. bending of sound waves

Answer

**Step-by-Step Solution:**

1. **Understanding Echo**: An echo is a sound that is reflected off a surface and heard again after a short delay. It occurs when sound waves travel from a source, hit a surface, and bounce back to the listener.

2. **Example of Echo**: Imagine you are standing in front of a wall and you shout. Your voice travels towards the wall, reflects off it, and returns to you. This is the basic principle of how an echo is produced.

3. **Conditions for Echo**: For an echo to be clearly heard, the reflecting surface must be hard (like a wall) and the distance between the source of sound and the reflecting surface should ideally be at least 17 meters. This distance helps in distinguishing the original sound from the reflected sound.

4. **Reflection of Sound Waves**: The key process in the production of an echo is the reflection of sound waves. When sound waves hit a hard surface, they bounce back, creating the echo effect.

5. **Conclusion**: Therefore, an echo is produced due to the reflection of sound waves.

**Final Answer**: An echo is produced due to the **reflection of sound waves**.

---