A tree falling in the forest makes a sound only if something hears it fall. Vibrations in the air and ground near the tree are not 'sound' unless perceived by a creature sensitive to them. Sound is not vibration. Sound is the perception of vibration.
Yes, if someone is there to hear it. Otherwise, no.
A huge thump if it is a big tree.
I think sound is the same whether one is there to hear it or not. I get the Zen point of the question (kinda sorta) but it is a bad example of pointing out emptiness, etc. I never really thought it was a very good way to illustrate the point the sages were getting at.
It even makes a lot of noise!
Yes , TIMBER
It makes sound waves regardless of whether anyone hears them or not (basic physics). But those waves don't become sound until they're heard.
It depends on what you mean by sound.
If sound is something that has to be heard or observed than no.
If sound is the propegation of pressure through air then yes.
its drowned out by the chainsaw