Heisenberg's Uncertainty Principle The uncertainty principle is introduced first by German Physicist Werner Heisenberg in 1927. It addressed that due to the property of the universe, it is impossible to know the exact position and speed of a particle no matter what happens. Einstein and other famous physicists tied "break" this law. However, they could not find any counter examples.
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As people explore more and more on the classic physics, they thought that now physics is perfect because we already have all the rules. However, there are things in the physics world cannot be explained by the classic physics. Therefore, they then discover a property of wave-particle duality, which changed the world. The believe that light has the ability to express attributions of wave or particles in different situations. The picture in the right is one of the most famous experiment -- Young's double-slit interferometer. This experiment provided firm experiment of the wave theory of light.
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As people fully understood wave-particle duality, they also realized the problem that the theory brought. It is easy for people to measure the wavelength, direction, and speed of wave. However, due to the property of wave, we cannot give a definite position to wave. As for particles, it is easy to people to get the position, but they cannot give it a definite speed. Therefore, people created models to estimate the position and speed. Yet, scientists still cannot find the precise data.
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