Question

Echoes produced within our rooms are not noticed, they can however be heard in an open field.

• A. True
• B. False

Answer 1

The correct option is A True

1. An echo is a reflection of sound that is heard by the observer with some delay after the sound is released from the source.
2. The minimum distance between the source of sound and the reflector must be $17m.$
3. The minimum time taken by the reflected sound to reach the listener should be $0.1s.$
4. Thus, an echo can be heard if the distance between the reflecting surface and the observer is greater than $17m.$

Hence, the given statement is true.