Young's Double Slit experiment


by raknath
Tags: double, experiment, slit, young
raknath
raknath is offline
#1
Jul22-09, 12:24 AM
P: 61
Hi all

I have a doubt on this

The experiment per se does not say anything wrt to the size of the slit right?

Now my question here is, if i actually reduce the size of the slit to such a size that only one atom of a particular gas(say helium) can pass through this

Now let us say i bombard the slits with helium and then shine light(laser if you like, of different phases) on it then, would the interference pattern still be observed, or will the light get blocked out?
Phys.Org News Partner Physics news on Phys.org
Better thermal-imaging lens from waste sulfur
Scientists observe quantum superconductor-metal transition and superconducting glass
New technique detects microscopic diabetes-related eye damage
DrChinese
DrChinese is offline
#2
Jul22-09, 10:44 AM
Sci Advisor
PF Gold
DrChinese's Avatar
P: 5,146
Quote Quote by raknath View Post
Hi all

I have a doubt on this

The experiment per se does not say anything wrt to the size of the slit right?

Now my question here is, if i actually reduce the size of the slit to such a size that only one atom of a particular gas(say helium) can pass through this

Now let us say i bombard the slits with helium and then shine light(laser if you like, of different phases) on it then, would the interference pattern still be observed, or will the light get blocked out?
There are issues about slit size and spacing. For there to be interference, there must be multiple paths without cancellation. There are a number of related issues.

Assuming that: if you shine light incident such that the path taken can be determined, then the interference disappears.
raknath
raknath is offline
#3
Jul22-09, 11:46 PM
P: 61
Quote Quote by DrChinese View Post
There are issues about slit size and spacing. For there to be interference, there must be multiple paths without cancellation. There are a number of related issues.
Like?

DrChinese just wanted to know, why is size never taken into account for this experiment, is it because it has never been repeated with other particles like electrons and with varying slit sizes. Seems a pity that such a nice experiment does not have enough data

Quote Quote by DrChinese View Post
Assuming that: if you shine light incident such that the path taken can be determined, then the interference disappears.
Why would the interference disappear if i shine laser beams, phase shifted wrt each other?

DrChinese
DrChinese is offline
#4
Jul23-09, 08:37 AM
Sci Advisor
PF Gold
DrChinese's Avatar
P: 5,146

Young's Double Slit experiment


Quote Quote by raknath View Post
Like?

DrChinese just wanted to know, why is size never taken into account for this experiment, is it because it has never been repeated with other particles like electrons and with varying slit sizes. Seems a pity that such a nice experiment does not have enough data



Why would the interference disappear if i shine laser beams, phase shifted wrt each other?
1. Interference has actually been demonstrated with all kinds of subatomic particles, including molecular nuclei (such as fullerene). So size been investigated. In fact, there is a web page that shows what happens when size parameters are varied, although I don't have the link in front of me.

2. Any mechanism that allows the "which slit" information to be learned will cause the interference to disappear.


Register to reply

Related Discussions
Young's double slit experiment Introductory Physics Homework 20
Young's double slit experiment Introductory Physics Homework 1
young's double slit experiment General Physics 2
Young's Double Slit Experiment Introductory Physics Homework 5
Young's Double slit Experiment Classical Physics 2