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Q: To hear different echoes, the minimum distance of obstruction from the source of sound should be ……
  • A. 172 m
  • B. 17.2 m
  • C. 344 m
  • D. 34.4 m
Correct Answer: Option B - See the explanation of above question.
B. See the explanation of above question.

Explanations:

See the explanation of above question.