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

Question

Accepted Answer

Depends on definitions. If 'sound' means pressure waves — yes. If 'sound' means the perception of them — no. — 300 years old, still a party question. Berkeley used it to argue that reality requires an observer. Empiricists disagree.

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