Multiple choice

Echo is heard due to ___.

  1. reflection

  2. scattering

  3. refraction

  4. interference
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An echo is formed when sound waves reflect from a surface and return to the listener after a time delay (typically at least 0.1 seconds for human perception). Large, hard surfaces like cliffs or buildings are good reflectors and produce clear echoes.

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