Multiple choice general knowledge science & technology

What causes an echo

  1. Absorption of sound waves

  2. Reflected sound waves

  3. Sound waves travelling through water

  4. Sound waves breaking the sound barrier
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An echo is produced when sound waves reflect off a surface and return to the listener. The reflected sound reaches the ear after a short delay, creating the perception of a repeated sound. Absorption would reduce echo, while transmission through water or breaking the sound barrier are unrelated phenomena.

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