Light Interference & the Double Slit Experiment

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# Light Interference & the Double Slit Experiment - PowerPoint PPT Presentation

Light Interference &amp; the Double Slit Experiment. By Zach Schmidt &amp; 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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Presentation Transcript

### 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
The Experiment

Components:

Light Source: Lasers

Detector: Smooth surface

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
• w x s=C, INVERSE
• Where w= fridge width

s= slit separation

C= constant

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

l= wavelength

C= constant

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