In the previous lecture we talked about the idea that light can be seen to be a wave by double slit experiment, demonstrating the wave property of interference. We also said that the photoelectric effect showed that light is also a particle, existing as a photon. The energy of the photon is given by E = h. Just as light can be said to act as either a wave and a particle, depending on the experiment you do, the same is true of particles like electrons or neutrons. Electrons and neutrons, just like light photons, exhibit interference in a two slit experiment.
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