Question regarding the double slit experiment

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Discussion Overview

The discussion revolves around the double slit experiment, focusing on the behavior of photons as they pass through slits and interact with a recording device. Participants explore concepts of wave-particle duality, probability distributions, and the implications of photon interactions with barriers and recording apparatuses.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions why a wave does not condense when part of it strikes the barrier, suggesting confusion about the nature of wave behavior in the experiment.
  • Another participant clarifies that the wave is not a physical wave but a probability distribution for the location of a particle, indicating that there is no actual "condensing" of the wave.
  • A participant inquires whether the concept of a wave is applicable, leading to a discussion about the nature of particles and their discrete qualities at detectors.
  • There is a question about whether a significant number of photons are absorbed or reflected by the barrier instead of passing through the slits, which is confirmed by another participant.
  • Participants discuss the emission of photons one at a time and how this relates to the formation of a diffraction pattern over time, emphasizing the probabilistic nature of the wavefunction model.
  • One participant asks if cutting slits in the recording paper would repeat the process, to which another participant confirms that a second interference pattern could be observed, depending on slit placement.

Areas of Agreement / Disagreement

Participants express differing views on the nature of photons and their behavior in the double slit experiment, particularly regarding the concepts of wave and particle. There is no consensus on the interpretation of these behaviors, and multiple competing views remain throughout the discussion.

Contextual Notes

Participants express uncertainty regarding the terminology and concepts involved in the double slit experiment, indicating a reliance on probabilistic interpretations and the implications of photon interactions with barriers and recording devices.

drawkcab
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I'm just a layman with an interest in science, so my terminology won't be accurate. Sorry.

Set up for question: the wave-front splits as it passes through the slits and must (I guess?) condense to a point upon impact with the recording device (paper/film etc).

The question: if a photon is given to behave as a wave until it contacts matter, and thereupon condenses to a particle, why doesn't the wave condense when part of it strikes the barrier through which the slits are cut?

Also, if you cut slits in the recording paper is the process repeated through a second iteration (albeit at a diminished intensity)?

Thinking about this experiment is driving me insane. A logical explanation seems always just out of reach. Thanks in advance for any light you can shed on this for me.
 
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drawkcab said:
the wave-front splits as it passes through the slits and must (I guess?) condense to a point upon impact with the recording device (paper/film etc).

Wrong guess. It is a wave in the sense that the probability distribution for finding the point-like particle evolves in the same manner as a wave front, including the interference with the other wave front: the recording device registers a particle in accordance with the modeled probability distribution. There's no condensing.
 
So there is no wave per se? Only a wave-like probability distribution for the changing particle position?
 
Yes. Of course, that rules out the projectile-like particle model as well. We call them "particles" because they have a discrete point-like quality at the detectors. Neither "wave" or "particle" would be an appropriate term if referring to their daily life counterparts.
 
Ok, thanks. Does that mean that a large percentage of the photon emissions don't strike the recording apparatus at all, having struck the barrier instead of passing through a slit?
 
Yes, they have been absorbed or reflected by the barrier's material. Note however that you can emit one photon at a time, and no matter the rate (you could emit one photon per year if you wanted to) the photons that do pass through the barrier will still form the diffraction pattern when enough events have been collected. So the probability wavefunction model associates a whole probability wave pattern, in this case complete with multiple fronts (for n slits), to each singular photon.
 
drawkcab said:
Also, if you cut slits in the recording paper is the process repeated through a second iteration (albeit at a diminished intensity)?

Yes. A second interefence pattern could be observed on a second screen beyond the first.

If you want to take this further, it's worth understanding how this depends upon slit placement.
 
Last edited:
Thanks ddd123 and craigi.
 

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