Heisenberg's Uncertainty Principle Explained

Heisenberg's uncertainty principle tells us that it is impossible to simultaneously measure the position and momentum of a particle with infinite precision. In our everyday lives we virtually...

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Today I am doing an experiment that demonstrates Heisenberg’s Uncertainty Principle. Saoher I have a green laser and I am firing it down towards the front of the room througha narrow slit. Now that slit can be adjusted so it can be made narrower or wider. And thelaser spot is projected on to a screen behind it. So what do you think is going to happento this spot on the screen as I narrow the slit? Well, let’s have a look.You see exactly what you would expect. The spot gets narrower and narrower. The sidesare getting cut off by the slit. It makes complete sense. And if you stop there youwould never realize that Heisenberg’s Uncertainty Principle is at work. But if you keep goingsomething strange happens. As you make the slit ever narrower the spot starts to sprea...