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Q: 1059. By which a sound is reflected from a distance of at least 17m (approx). . . . . . . . happens.
  • A. echo space
  • B. refraction
  • C. echo
  • D. reflection
Correct Answer: Option C - An echo can be heard distinctly if the minimum distance between the source of sound and the reflecting surface is 17.2 m.
C. An echo can be heard distinctly if the minimum distance between the source of sound and the reflecting surface is 17.2 m.

Explanations:

An echo can be heard distinctly if the minimum distance between the source of sound and the reflecting surface is 17.2 m.