D wins.
Since the westbound train is blowing its horn, the westbound train is “the source of the sound.” Therefore, the passengers on the westbound train are traveling along with the source of the sound, and thus are neither approaching the source nor receding from it. Hence the westbound passengers should hear the true pitch of the sound.
According to the passage, the passengers in the eastbound train are approaching the source of the sound, the westbound train; the distance between the
...
Since the westbound train is blowing its horn, the westbound train is “the source of the sound.” Therefore, the passengers on the westbound train are traveling along with the source of the sound, and thus are neither approaching the source nor receding from it. Hence the westbound passengers should hear the true pitch of the sound.
According to the passage, the passengers in the eastbound train are approaching the source of the sound, the westbound train; the distance between the
...
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