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Q.

When a sound wave hits a barrier, it ..........

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a

Bounces back

b

Decreases

c

Increases

d

Stops

answer is A.

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Detailed Solution

When a sound wave hits a barrier, it bounces back. 

Sound waves can reflect, like all waves. The substantial obstructions reflect sound waves. An echo is the sound produced when the sound wave is reflected by a significant obstruction.

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