Yes. Sound is a physical property. I guess you could just as easily ask, if a person gets an infection, but had no symptoms, did they get sick?

Still a reasonable question, but if an electron passes through a slit and no one observes it, does the wavefunction ever collapse?

A. The question implies that if there was someone around to hear it it makes a sound. That sound doesn't go away just because no one hears it.

B. If you're all alone in your house and you scream, did you not make a sound because no one else was in the house?

Depends how you define the word 'sound'. Does it mean pressure waves in the air, or brain activity triggered when ears detect pressure waves in the air ? The questions that that point in turn raises therefore are. Is it possible to express truth using human language ? Is all philosophy merely about defining words ? Is all philosophy bogus since it is impossible to reach truth using human language ? Is it a mistake to believe that human language can be a source of truth ? And. Is all knowledge merely linguistic sophistry ?

It depends, says a child of the new millennium. Let me check and see is there any sonic or audio sensors on site recording data.

Yes. The same science applies whether someone is there or not.

Perhaps. I’m kinda agnostic about it

Even an insect might respond, and there are no sterile forests, so yes.

Is sound a vibration in the air or the way that vibration is interpreted by an animal brain.

No. Sound is the sensation excited in the ear when the air or other medium is set in motion."

The Chautauquan, 1883, vol. 3, no. 9, p. 543