If a tree falls in a forest and no one is there to hear it, does it make a sound?  My answer is “no,” but before you think I’ve lost my mind take a minute to read my explanation.

Sounds come from sound waves.  When the tree falls it creates sound waves, which goes through the air.  When those waves reach our ears, that information is translated into sound.

If a tree falls in the forest and no one is there to hear it, does it make a sound?

No, the tree made a sound wave.  It did not make a sound.