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Heisenberg indicated that it cannot be done=who is right?

2006-11-02 04:45:19 · 2 answers · asked by goring 6 in Science & Mathematics Physics

Isnt it true that in relativity theory as soon as you try to measure a distance it already has schrunk and at that point time has dilated so you cannot measure momentum because both mass and velocity changes as soon as you observe it?

2006-11-02 06:55:09 · update #1

2 answers

They're both right. To the limits of our ability to measure relativistic effects, they confirm the theory. Of course we can't measure anything with absolute precision, and that's where Heisenberg's Uncertainty Principle comes in.

The uncertainty principle states that either a body's position or momentum (state of motion) can be measured to an arbitrary degree of accuracy, but not both at the same time. In fact, the more accurate one measurement becomes the less accurate will be the other.

This is rather obvious, since if you have an exact position for something it's like one frame in a movie, so you have no idea how fast it's moving or in what direction at that instant. Conversely, the longer you observe an object in motion the better idea you have of its momentum, but to acquire this information the position of the object has to change.

Uncertainty usually applies to quantum mechanics but the principle applies everywhere. The biggest problem physics faces today is the fact that quantum theory and relativity theory work fantastically well with the very small and the very large, respectively, but they don't overlap or imply each other. We have two entirely separate theories to describe different aspects of reality - but they *must* be related in some subtle way that we haven't figured out yet, the so-called Theory Of Everything, or TOE.

2006-11-02 05:06:37 · answer #1 · answered by hznfrst 6 · 0 0

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2016-12-28 10:56:39 · answer #2 · answered by ludwig 3 · 0 0

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