- #1

clementc

- 38

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**What is Heisenberg's Uncertainty Principle??**

## Homework Statement

Hey everyone,

Until very recently, I had always thought that Heisenberg's uncertainty principle was that

[tex]\Delta x \Delta p \geq \frac{h}{2\pi}[/tex] (or [tex]\hbar[/tex])

However, I'm doing my final year of high school physics this year, and my physics teacher, tutor, random textbooks and even Wikipedia say its [tex]\Delta x \Delta p \geq \frac{h}{4\pi}[/tex].

(Well Wikipedia also says its [tex]\Delta x \Delta p \geq h[/tex] so yeah...LOL)

I was just wondering which one was really correct. I'm thinking [tex]\frac{h}{2\pi}[/tex] like it says in Giancoli and Halliday/Resnick? But not really sure.

Thank you =D