Is light a wave or a particle? Well, it's not a particle. The photoelectric effect can be explained with a wave model for light and a quantum model for matter.

Does light behave more like a particle, or like a wave? Today we know the surprising answer. Here's why it took so long to get there.

Does light behave more like a particle, or like a wave? Today we know the surprising answer. Here's why it took so long to get there.

Wave-particle duality is a cornerstone of quantum mechanics, which is our modern theory of how subatomic particles behave.

In the traditional formulation of quantum mechanics, when a particle is measured -- meaning it is found to be in one particular location -- the wave function is said to collapse.

Wave-particle duality inevitably leads to the Heisenberg Uncertainty Principle. All periodic processes can be analyzed using the Fourier transform. The Fourier transform decomposes a function of ...

But until we figure out a way to test quantum gravity using gravitational waves, we won't know whether the "particle" part of wave-particle duality holds for gravitons.

The classic quantum mechanics problem is a particle in a 1-D box. Here is a numerical solution to that problem.