I was recently watching a video by the channel Minute Physics, about the effect of quantum tunnelling and it's characteristics. In the video, the presenter told that quantum tunnelling refers to the state of probability of a sub-atomic particle to be in a place it is not supposed to be.
For example, if a ball is rolled down a cliff, in the classical world, there is no chance that the ball will cross the height, where it is thrown form. But, in the quantum world, there is a chance that if a sub atomic particle undergoes the same experiment, it might cross the hill, and there is also a minute chance of the particle being present in the hill.
It was further told that this creates a possibility of an electron been found in the nucleus, along with the protons and the neutrons. But, clearly, according to Heisenberg, this is not possible, as this would cause the speed of electron to be over the speed of light??
https://www.youtube.com/watch?v=cTodS8hkSDg --> This is the link to the video, and I would like for someone to correct me, if wrong, in the explanation of this video, or explain me the phenomenon behind this observation. Thanks!!