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When you talk in your head, is there sound? No. Tinnitus is the perception of a sound in the ear or head that isn't produced by an outside source. It's the same as when you dream. You don't hear, you think you hear, perception. There's a difference between the receptors in your brain translating...

No, it doesn't.

A sound is the translation of the vibration. A sound is only a sound when heard.

Interestingly, leaves and grass on another planet might be purple, because they might use a different part of the light spectrum for photosynthesis.

Because light doesn't need to be perceived, seen or observed to be there, it is emitted and absorbed by charged particles.

It's an interesting debate. Perception is a great thing. If I give you a box, and tell you there's a pound coin in there, but you cannot perceive the matter to be a pound coin, is it really something, since you cannot see it? Anyway back to the senseless banter, please. Police...

But there is only a sound when you listen back. Until then, like the video itself, it's just electrical information, awaiting interpretation into video and sound.

Really? It seems people have their own opinions, but what is 'sound'? It is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation...

Same, no sound. The vibration would cause movement of the diaphragm in the microphone, but there wouldn't be a sound associated unless someone/thing was there to perceive it.

Wrong. Moving particles only become sound when there is an ear to receive them and transmit them to the brain to recognise it. The falling of the tree will ONLY produce vibration of the air. If there be no ears to hear, there will be no sound. It's simple science.

No.

:lolol: On public land you can film whomever you wish. On private property you cannot (unless it's your own home), without permission (a shopping mall, for example).