I am sort of confused about this. Wave particle duality says that sub atomic particles are waves. There is something more though. What is the actual meaning of wave particle duality?
Answer
I answered a question related to this a few days ago, so I suppose I'll try to summarize it here.
Wave particle duality doesn't really say that waves are particles. It says that "particles" aren't really particles, nor are they really waves, they're just little objects that have some properties of waves and some properties of particles, and there are certain situations where one is more visible than the other. I've heard it said (in a very rough sense) that subatomic objects travel like waves, and interact like particles. Again, this is a huge simplification, but there's an important intuition, which is that these objects are always a little like waves and a little like particles. We can describe their position by a function that tells you the probability that the object will be at a particle point in space at a particular time; this function takes the mathematical form of a wave, so we call it a wavefunction, and this is the sense in which particles are like waves. When these objects interact, however, we tend to see them more as particles, like little classical marbles.
The double-slit experiment is a good example of this. Once more, I emphasize that this is a very big simplification, but just for the purposes of giving you a bit of context, we can imagine that as the electron travels through the slits, its wavelike character is more obvious, and so there are noticeable behaviors we normally attribute to classical waves, like interference. When it collides with the backboard, however, its particle-like character is more obvious, and so we see a single point where the electron collided with the wall. But at all times, the electron had both wave and particle characteristics, and that's the essence of wave-particle duality.
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