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vaieri [72.5K]
3 years ago
11

Please send help also 20points

Biology
2 answers:
Makovka662 [10]3 years ago
6 0

Answer:

An echo occurs when a sound wave reflects back towards its source after hitting a hard surface.

You are right!

frosja888 [35]3 years ago
6 0

Answer:sound wave

Explanation: Echo is a sound heard after a sound wave hit a hard surface. The sound is what is heard back as echo. An echo doesn't occur when the sound wave have been absorbed before hitting an hard surface so in a large crowd you might not hear an echo because the sound wave have been absorbed. The echo is heard faster when you are standing close to a hard surface than when you are far away a hard surface.

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