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Q: Echoes may be heard more than once due to successive or multiple :
  • A. rarefaction
  • B. reflection
  • C. diffraction
  • D. refraction
Correct Answer: Option B - The sound of echoes occurs due to the successive or multiple reflection of the sound.
B. The sound of echoes occurs due to the successive or multiple reflection of the sound.

Explanations:

The sound of echoes occurs due to the successive or multiple reflection of the sound.