Question

Write three essential conditions for an echo to be heard.​

Answer 1

The two conditions for echo to be heard are:1. The minimum distance between source and reflecting surface should be 17.2 m . 2. To hear a distinct echo, the interval between original and reflected sound must 0.1 second

Answer 2

Answer:

Conditions for echo to be heard :

1. Distance between source and reflecting surface should be 17.2 m

2. The reflecting surface must be rigid like a cliff or building

3. There should be sufficient time gap between original and reflected sounds. So, if we want to hear distinct echo, the reflected sound must reach the ear 0.1 s after the direct original sound.