Uncertainity Problem


by string_theory
Tags: uncertainity
string_theory
string_theory is offline
#1
Nov21-03, 04:01 AM
P: 16
Hi dear virtual friends,

I am now going to ask you something. I would be pleased if you would answer me.

In an exam I was asked to show that for a particle in a box of width length L , delta (x)delta(p)>=h/(4*pi) holds.
I think this is not a logical question. Because I think it is like asking something like this: Prove A using A.

I would be really grateful if you would write something regarding this.
Thank you.

P.S. My problem is not envolving you in doing my homework. I just wanted to know if what I think is right or wrong.
Phys.Org News Partner Physics news on Phys.org
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Mapping the road to quantum gravity
Chameleon crystals could enable active camouflage (w/ video)
lethe
lethe is offline
#2
Nov21-03, 04:07 AM
lethe's Avatar
P: 657
i think you were supposed to calculate Δx and Δp separately, then multiply the two together, and compare it to h/4pi.

you know, find the expectation value of x, and then the expectation value of x2 and all that jazz.

of course you are not allowed to use the Heisenberg Uncertainty principle to show that the Heisenberg Uncertainty principle is true. that is circular.
string_theory
string_theory is offline
#3
Nov23-03, 01:31 PM
P: 16
Thank you very much for youranswer.


Register to reply

Related Discussions
Help Uncertainity principle problem Introductory Physics Homework 2
Uncertainity and Error Question Introductory Physics Homework 1
un- uncertainity Quantum Physics 3
uncertainity Advanced Physics Homework 1
Uncertainity Problems Introductory Physics Homework 1