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Existentialism is surely all about empiricism and perception, that's what the whole debate is about!

See above.

'within the range of hearing' is the key point as I've said before. The points here are very subtle. In measurable terms inside our existence and knowledge, of course the falling tree makes a sound. We know how to measure sound, we know how it works, what frequencies create notes etc. etc...

Yes, you have kind of got it, but not quite prepared to make that final conceptual leap. Before any living creature existed that tree makes no sound, there is no such thing as sound because all the falling tree creates is vibrations and oscillations through air, liquid or solid. The energy is in...

'composed of frequencies within the range of hearing' - is the important part. Without hearing, the sound does not exist. The tree falls, it makes all the oscillations / vibrations to create sound, they are all present, but they are not sound unless they are perceived. Conceptually, based on...

We can't of course continue without reference to Schrodinger's Cat....

I've sort of answered that, but visible light is actually a small part of Electro Magnetic Radiation which is a form of energy emitted by charged particles. The important part here, is that EMR will travel in a vacuum at precisely the speed of light. It is a universal constant, it exists...

Of course colour is a different matter, and like sound it is a perception. Light is electromagnetic radiation (EMR) which travels through space carrying radiant energy. Visible light from the EMR is what we are able to perceive. Without our eyes, green doesn't actually exist, it is simply a...

Again, smell is simply a perception same as sound. It is only smelling as it is perceived to do so. Imagine the world pre-life, there is no sound or smell because there is nothing to perceive the information which is simply vibrations and particles in the air. Light on the other hand is a...

Without the ear, it is just vibration. You only know the dog whistle makes a sound due to the reaction of the dog. Without a dog it doesn't make a sound. Sound is therefore perception. Without perception, you cannot prove it exists. Light is different as it travels in a wave-particle duality -...

Microphones or sound receiver are a type of transducer - a device which converts energy from one form to another. Microphones convert acoustical energy (sound waves) into electrical energy (the audio signal). Different types of microphone have different ways of converting energy but they all...