If a tree falls in a forest and no one is around to hear it, does it make a sound?
Of course it does, assuming that there is no freak occurrence like the wind blowing in just the right direction for it to silently fall down. In general, yes, it will make a sound, regardless of whether anyone or anything is around to hear it. The same physical actions take place, creating a "sound", irrespective of the presence of a human/observer of any species.
It's just that nobody happens to hear it because they aren't there at the moment.
I seriously, 100% honestly don't understand the "point" of this so-called thought experience. Maybe I'm missing something, but to me, it sounds like somebody misunderstood what "philosophy" means. Or maybe I'm the one who misunderstands it...
Do they mean that we cannot know for sure that the tree did make a noise, because we weren't there and (supposedly) weren't allowed to have recording equipment there to detect the fall and its expected sound? Do they mean that maybe a fox ran by and dampened the tree's fall so it didn't make a sound loud enough?
It seems so pointless to ask if the tree makes a sound if nobody is around, because literally nothing indicates that it would matter that a human is around to hear it for it to make the sound. It seems like a parody of a thought experiment to me.