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How to do a double screen?

In double slit experiments, how long do the imprints of the interference patterns remain on the screen?

  • Do the impacts indent the screen? What material is the screen made of?

  • Answer:

    The results of the experiment doesn't matter on the screen, so long as it can record where the particle was when it is interacted with.    In modern AMO experiments they fluoresce atoms induced from monochromatic laser laser light. If this is the case, then the light lasts as long as you're able to hold the atoms and shine line on them, frequently in the millisecond to tenth of second range.   But it could be as simple as a series of Geiger counters if the particles are fairly energetic, then it would be a simple blip.  If you are interfering light, it's possible you could use photographic film and then the impression would last forever. If you're curious for purely intellectual reasons, I'm sure that there are dozens of articles per year performing this experiment that are published in the Physical Review or similar academic journals (some of which are open access).  If you're looking for experiments to do in the classroom or at home, there are several publications geared at you that should have multiple ways of performing the experiment.

Jay Wacker at Quora Visit the source

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That depends on the specific experiment. The simplest variation of the (single, double, etc.) slit experiment is where you shine light through the slit(s) and watch the interference pattern on a screen. In this case the pattern would of course disappear as soon as you turn off your light source. You can actually do this experiment by yourself at home, as described in this YouTube video: There are many other variations of the experiment. Some use http://en.wikipedia.org/wiki/Photographic_film (like the one in old cameras) or a http://en.wikipedia.org/wiki/Charge-coupled_device (like in digital cameras) to detect individual photons of light. In the former case, just like in a camera, once you shine light on a photographic film, it's "captured" forever. In the latter case, the CCD simply records the position at which the photon was detected, but there's no actual image that remains on the screen, only in the computer's memory. EDIT: It works exactly the same if you want to detect electrons instead of photons. Photographic film and CCDs can detect electrons. See, for example, http://en.wikipedia.org/wiki/Transmission_electron_microscopy for more information.

Barak Shoshany

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