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Why consider it a philoshophical question?

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Yahoo! Answers - "If a tree falls in the forest and no one hears it...." Why considered philoshophical question?

The philosophy is also about the meaning of the word "sound" not about the tree. Is the sound the vibration of the air or the vibration of the ear drum? A more modern example would be a vibration that is to soft to hear or one on the wrong frequency, to what point should we call that a sound?