Heisenberg's uncertainty principle

  • Thread starter lavster
  • Start date
  • #1
217
0
in heisenbergs uncertainty principle, how do you know when to use hbar, h, h/2 or hbar/2?

thanks
 

Answers and Replies

  • #2
G01
Homework Helper
Gold Member
2,665
16
Heisenberg's uncertainty principle is

[tex]\Delta x \Delta p \geq \frac{\hbar}{2}[/tex]

Sometimes people will drop the factor of 1/2 or leave out the 2 pi and write h instead of hbar.

It all depends on what you're looking for. If you need an exact value for the uncertainty, you should use [itex]\hbar/2[/itex].

If you're only only concerned about getting an order of magnitude estimate, dropping the factor of 2, 2 pi, or both, won't affect anything.
 

Related Threads on Heisenberg's uncertainty principle

Replies
8
Views
6K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
13
Views
2K
  • Last Post
Replies
22
Views
6K
  • Last Post
Replies
6
Views
2K
  • Last Post
2
Replies
38
Views
7K
  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
8
Views
5K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
9
Views
2K
Top