Yes and no. It all depends in what field you're describing sound. In physics, a tree that fell in the forest most definitely made a sound. In psychology, it doesn't.
In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid.
In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
Yes and no. It all depends in what field you're describing sound. In physics, a tree that fell in the forest most definitely made a sound. In psychology, it doesn't.
https://en.wikipedia.org/wiki/Sound
To be honest, I'm with the physicists.