Q: If a tree falls in the forest and no one is around to hear it, does it still make a sound?

A: No, sound is the reaction our brain makes when our eardrums are caused to vibrate, if there is nothing making our eardrums vibrate, there is no sound. So if no one is within earshot of the falling tree, then it does not make a sound.

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it made a sound but the soundwaves didn't reach anyone's ears.

No, because sound is what happens when soundwaves DO reach our ears.