How Does White Light Affect Double Slit Interference Patterns?

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In summary, in the double slit experiment, white light (light of all visible wavelengths) will produce a pattern of interference fringes that combines the individual patterns of each wavelength. This is in contrast to a normal monochromatic diffraction, where only one color of light is present and produces a single interference pattern.
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Homework Statement


How would white light in the double slit experiment be different from the pattern of a normal monochromatic diffraction?



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The Attempt at a Solution


No idea
 
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Light of a single wavelength makes a certain type of pattern. If many different wavelengths are present at the same time, you should observe all those individule patterns superimposed. Think about what that will look like.
 
  • #3
So is white light defined as "light from a single wavelength?" If this is so, there will be no interference and light through the slits would never interfere, right?
 
  • #4
"white light" is an expression for light of all visible wavelengths. Light of a single wavelength will have a specific color (to our eye). Light of a single color produces interference patterns. In fact that is usually what you see in textbooks; a pattern of interference fringes due to a laser beam (single wavelength) passing through two narrow slits. To form an interference pattern, something must be interfering with something else, but it is not one color of light interfering with another.
 

1. How does the double slit experiment demonstrate the wave-particle duality of light?

The double slit experiment involves sending a beam of light through two narrow slits and observing the resulting pattern on a screen. This pattern shows interference fringes, which can only be explained by the wave nature of light. However, when the experiment is repeated with a detector at one of the slits, the interference pattern disappears, indicating the particle nature of light. This phenomenon of light behaving as both a wave and a particle is known as wave-particle duality.

2. What is the significance of the distance between the two slits in the double slit experiment?

The distance between the two slits in the double slit experiment determines the spacing of the interference fringes on the screen. A wider distance between the slits will result in a wider spacing of fringes, while a smaller distance will result in a narrower spacing. This distance also affects the overall intensity of the interference pattern, with a wider distance resulting in a dimmer pattern and a smaller distance resulting in a brighter pattern.

3. How does the wavelength of light affect the interference pattern in the double slit experiment?

The wavelength of light has a direct impact on the spacing of the interference fringes in the double slit experiment. This is because the distance between fringes is directly proportional to the wavelength of light. This means that a shorter wavelength of light will result in a narrower spacing of fringes, while a longer wavelength will result in a wider spacing. This phenomenon is known as diffraction and is a key aspect of understanding the behavior of light in the double slit experiment.

4. Can the double slit experiment be performed with other types of particles besides light?

Yes, the double slit experiment has been performed with a variety of particles, including electrons, atoms, and even large molecules. The results of these experiments have consistently shown the same interference pattern, demonstrating that the wave-particle duality applies to all particles, not just light. This has significant implications for our understanding of the fundamental nature of matter.

5. How does changing the angle of the light beam affect the interference pattern in the double slit experiment?

The angle of the light beam has a direct impact on the placement of the interference fringes on the screen in the double slit experiment. When the angle of the beam is changed, the position of the fringes will also shift. This is due to the fact that changing the angle changes the path length of the light waves, resulting in a different interference pattern. This phenomenon is known as angular dispersion and is an important aspect to consider when conducting the double slit experiment.

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