Multiple choice general knowledge

Echoes are due to

  1. Refraction of sound waves

  2. Polarisation of sound waves

  3. Diffraction of sound waves

  4. Reflection of sound waves
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D Correct answer
Explanation

Echoes are produced when sound waves reflect off a hard surface and return to the listener after a delay. The sound must travel a minimum distance to create a perceptible echo. Refraction, polarisation, and diffraction are other wave phenomena but do not cause echoes.

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