# Heisenberg's principle

Hi, I've a doubt!
The principle says that we cannot find simultaneity the position and the momentum of a particle, I understand this because if I haven't understood bad it's because to find the position of a particle we need to trhow photons to it (and more and more) as much as we want to be precis and this changes its velocity.

The one i don't understant is the one of time and energy. Why can't we find both exactly?

Thanks!!!!

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Energy defines how particle interact with the others. So you need to give it some time to interact.

Energy is a kind of cumulation effect. If you want to survey the energy of a system accurately, you need some time. So the time becomes inaccurate.

It's the inequality obeyed by the deviation of the energy distibution of the states forming a wave packet that evolves with a wave function $\Psi(t)$. In other words, a relation between the energy distribution of a wave packet and the characteristic time it takes to deform.

The interpretation stating that "the more accurately you want to measure the energy of a system, the more time it takes to measure" was shown to be wrong by Aharonov and Bohm in http://cos.cumt.edu.cn/jpkc/dxwl/zl/zl1/Physical%20Review%20Classics/quantum/019.pdf" [Broken]

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