Question

Echo is produced due to:
A. reflection of sound.
B. resonance.
C. refraction of sound.
D. none of these.

Answer 1

Hint: We have to learn some simple sound-reflecting points in this problem. The echo is something of a sound reflection.

Complete step-by-step solution -
Echo is a reflection of the sound that comes to the listener with a pause after the direct echo. The delay is directly proportional to the distance from the source and the listener to the reflecting surface. The echo created by the bottom of a well, by a house, or by the walls of an enclosed space and an empty room are common examples. The sound source is a single representation of a real echo.
The sound wave coming back from a solid or liquid surface is called sound reflection. Sound reflection follows the reflection law, just as the light wave does.
A polished or rough, and major obstacle is required to represent a tone.
The tone we heard following reflection is called echo. For example, if we shout loudly at the top of a hill or mountain, the same sound that we shouted can be heard through several reflections from the surrounding. And the amplification of sound is often called echo because of multiple sound wave reflection.
Echo is created by means of sound reflection with a minimum distance of 17.2 cm between the source and the observer.
Therefore, we may conclude that the echo is created by sound reflection.
So option (A) is the correct answer.

Note: First we have to know the definition of the term mentioned in the question to solve this type of question. Then we need to find out how it gets produced by its mechanism. Then we get the answer.