Question

Question for grade 4

Topic Sound

1. An echo is produced when

a. sound waves bounce off a surface.
b. there are many people in a room.
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Answer 1

Answer:

A) Sound waves bounce off a surface.

Answer 2

Answer:

An echo is produced when sound waves bounce off a surface. A is the correct answer.

Explanation:

Echo is produced by the reflection of the sound waves. It says that sound travels in one medium and strikes at the surface of another medium its direction changes this phenomenon is called the reflection of sound. On a solid surface, most of the sound waves get reflected. Another phenomenon shown by the sound waves is reverberation.