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      Question

      What is the minimum distance required for an obstacle to

      produce a distinct echo?
      A 11.2 meters Correct Answer Incorrect Answer
      B 17.2 meters Correct Answer Incorrect Answer
      C 32.2 meters Correct Answer Incorrect Answer
      D 42.2 meters Correct Answer Incorrect Answer

      Solution

      The minimum distance required for an echo to be heard is 17.2 meters at a temperature of 22 degrees Celsius, with the speed of sound in air being approximately 344 m/s.

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