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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. 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

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  1. Light Interference & the Double Slit Experiment By Zach Schmidt & Neekaan Oshidary

  2. Light: A Particle or Wave • Different tests support different sides of the argument • Today: dual theory • Young Experiment

  3. Double Slit Analogy

  4. Particles Through One Slit

  5. Particles Through Both Slits

  6. Interference or Not?

  7. The Experiment Components: Light Source: Lasers Double Slit: Pre-made slits Detector: Smooth surface

  8. INTERFERENCE!

  9. Testing Variables

  10. Distance and Fringe Width • w/D=C, DIRECT • Where w= fringe width D= distance between slits and detector C= constant

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

  12. Understanding Inverse relation of slit separation and fringe width.

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

  14. 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?

  15. What about Wavelength? • l= (S x W)/D

  16. Results • Helium-neon laser • Our calculation: 610.5 nm • Real value: 632.5 • Percent Error: 3.5%

  17. 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?

  18. Does This Make Any Sense?

  19. 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

  20. THE END!

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