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Light Interference & the Double Slit Experiment. By Zach Schmidt & Neekaan Oshidary. Light: A Particle or Wave. Different tests support different sides of the argument Today: dual theory Young Experiment. Double Slit Analogy. Particles Through One Slit. Particles Through Both Slits.

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light interference the double slit experiment

Light Interference & the Double Slit Experiment

By Zach Schmidt

& Neekaan Oshidary

light a particle or wave
Light: A Particle or Wave
  • Different tests support different sides of the argument
  • Today: dual theory
  • Young Experiment
the experiment
The Experiment

Components:

Light Source: Lasers

Double Slit: Pre-made slits

Detector: Smooth surface

distance and fringe width
Distance and Fringe Width
  • w/D=C, DIRECT
    • Where w= fringe width

D= distance between slits and detector

C= constant

slit separation and fringe width
Slit Separation and Fringe Width
  • w x s=C, INVERSE
    • Where w= fridge width

s= slit separation

C= constant

wavelength and fringe width
Wavelength and Fringe Width
  • w/l=C, DIRECT
    • Where w=fringe width

l= wavelength

C= constant

recap of relationships
Recap of relationships
  • w/D=C, Distance: direct
  • w*s=C, Slit separation: inverse
  • w/l=C, Wavelength: direct
  • Can we combine these into one larger equation?
results
Results
  • Helium-neon laser
  • Our calculation: 610.5 nm
  • Real value: 632.5
  • Percent Error: 3.5%
particle nature of light
Particle Nature of Light
  • Light consists of bundles of energy called photons
  • What would happen if we slowed down the laser, so only one photon at a time arrived at the slits?
conclusion
Conclusion
  • Light behaves like a wave; interference
  • We used this property to calculate the wavelength of light
  • Light also behaves like a particle
  • This behavior is described in the dual wave/particle theory