Originally posted by geepamoogle
The answer depends on whether or not the definition of sound requires there to be a listener.
Define it as a physical phenomona (wave motion through a physical medium in the form of alternating compression and decompression of said matter), and you can be reasonably certain that that phenomena would be present as an aftereffect, and thus it would make ...[text shortened]... sound.
Regardless, it is impossible to answer this as anything but a philosophical question.
I made the parallel of the Schrödinger's cat which in essence is that you can't tell anything about anything if there is no one observing it. The cat is neither or both dead and/or alive until you look.
If no one hear the sound, there is no way to find out if there were a sound or not. Even no way to tell that it was a tree that fell. Only when you observe, in one way or another, the probability wave collapses and the effect is evident.
Is this philosophical or not? Is quantum mechanics philosophical or not? I say it is neither until you think about it.