A crash will tell you exactly where the car is-or rather, was-but it will certainly change the car's speed in the process. It's a little bit like trying to find a moving car by rolling huge boulders across the road. Bouncing one of these off another particle might tell you where that particle is, but it will also give it a considerable shove, changing its speed in the process. Light itself is made of tiny particles called photons. The way to see them is to bounce light off them. Light from the sun bounces off the car and into your eyes, and you learn-ah ha! It's over there! The same is true of atomic particles. Here's one way to understand it: You usually find out where your car is by looking for it. Or, once you learn you're at a certain corner in Indianapolis, you can no longer say whether you're parked or racing the Indy 500. Very roughly, it states that if we know everything about where a particle is. It's like saying that because you know your car is going exactly fifty miles an hour, it's impossible to say which city you're driving in. Heisenbergs uncertainty principle is a key principle in quantum mechanics. You can either know the particle's speed or location exactly, not both. Likewise, the more you know about a particle's speed, the more uncertain it's location becomes. It says that if you measure a particle's exact location, there is no way you can determine its speed. Heisenberg's Principle deals with the tiny particles of matter that make up atoms. On today's Moment of Science we'll learn what this is, and try to clear up some of the uncertainty. One of the most bewildering developments of modern physics is the Heisenberg Uncertainty Principle.
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