# Double slit experiment for layman

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• wolram
In summary, the double slit experiment is a well-known phenomenon, but there is no specific information given about the experimental setup. Using three slits may affect the results, but it is important to understand that the particle does not actually go through multiple paths. The probability of the particle landing at any point on the screen is calculated by summing the probability amplitudes for all possible paths between the source and the screen.
wolram
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In the literature we are told that the double slit experiment works but are given no description of the experiment apparatus
How big are the slits, how far apart are they, or does it matter
Would using 3 slits make a difference, would photon go through A and B, or through B and C, or all 3.
When going through 2 slits is the photon energy halved or doubled., or the same. That would have me scratching my head.

DrChinese
wolram said:
In the literature we are told that the double slit experiment works but are given no description of the experiment apparatus
How big are the slits, how far apart are they, or does it matter
If you google for "practical double-slit experiment" you will find a number of good descriptions.
Would using 3 slits make a difference, would photon go through A and B, or through B and C, or all 3.
When going through 2 slits is the photon energy halved or doubled., or the same. That would have me scratching my head.
Don't be thinking as if the particle is going through both slits (or all three, in a triple-slit experiment). You'll hear it described that way in some popularizations, but that model is very misleading.

What's really going on: We calculate the probability of the particle landing at any point on the screen by summing the probability amplitudes for every possible path between the source and the screen. If there are two slits, there are two possible paths. If there are three slits, there are three possible paths... and so on. But this calculation isn't saying anything about which path the particle follows and it certainly isn't saying that the particle divides into pieces and goes through more than one path.

(If we put a detector in one of the slits, then we know to not count the path through that slit if the detector doesn't trigger, and to count only that path if it does trigger. But the general principle is the same - we're adding the probability amplitudes for all the possible paths between the source and the screen).

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wolram

## 1. What is the double slit experiment?

The double slit experiment is a classic experiment in physics that demonstrates the wave-particle duality of light. It involves sending a beam of light through two narrow slits and observing the interference pattern created by the light passing through the slits.

## 2. How does the double slit experiment work?

The double slit experiment works by sending a beam of light through two narrow slits and observing the interference pattern created by the light passing through the slits. The interference pattern occurs because light behaves like a wave and when two waves interact, they can either amplify or cancel each other out.

## 3. What does the double slit experiment prove?

The double slit experiment proves that light has both wave-like and particle-like properties. When the light is observed, it behaves like a particle, but when it is not observed, it behaves like a wave. This phenomenon is known as wave-particle duality.

## 4. Why is the double slit experiment important?

The double slit experiment is important because it helps us understand the fundamental nature of light and matter. It also played a crucial role in the development of quantum mechanics, which is the branch of physics that studies the behavior of particles at the atomic and subatomic levels.

## 5. What are the real-world applications of the double slit experiment?

The double slit experiment has many real-world applications, such as in the development of technologies like lasers, fiber optics, and holography. It also has implications in fields such as quantum computing and cryptography. Additionally, the concept of wave-particle duality has led to a deeper understanding of the fundamental laws of nature.

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