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In which of the following locations can a person hear the echo of a sound? Question 15 options: A) At least 16.6 meters in front

In which of the following locations can a person hear the echo of a sound? Question 15 options: A) At least 16.6 meters in front of the reflecting surface B) At least 33.2 meters behind the reflecting surface C) Less than 16.6 meters in front of the reflecting surface D) Less than 33.2 meters behind the reflecting surface

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