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My limited understand is that photons can we both or is a particle and a wave. But they have 0 weight(?)

I found this quote today:

"Quarks, like all elementary particles, are excitations of a quantum field. This, in and of itself, means it behaves like a wave, for basically ALL of its interactions.

But then what is a wave?

In the water, it is water being moved. Water is a molecule. which is a particle, which is hydrogen and oxygen atoms which are electrons, protons and neutrons (?) which are quarks and 20 years ago they were preons.

When you get down to this level, what is a particle? Do Quarks have different weights, which are directly composable to the weight of an atom?

Or is space - time - gravity a wave that is built of Quarks, Photons and whatever else?

How does one establish if something is a particle or a wave?

Qmechanic
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Let's take the example of light. Does it consist of electromagnetic waves of a certain frequency, or photons?

For visible light, there is no hard and fast division between wave-like and particle-like behavior; what you get depends on how you are measuring your system.

But for wavelengths much longer than that of visible light, the wave picture is more manifest. For wavelengths much shorter that that of visible light, the photon picture is more manifest. So whereas we talk about the energy of a gamma-ray photon, we don't talk about the energy of an AM-radio photon; similarly, we describe the AM-radio signal (but not the gamma-ray) in terms of wavelength.

niels nielsen
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