Light Interference & the Double Slit Experiment By Zach Schmidt & Neekaan Oshidary.
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Transcript of Light Interference & the Double Slit Experiment By Zach Schmidt & Neekaan Oshidary.
Light Light Interference & Interference & the Double Slit the Double Slit ExperimentExperiment
By Zach Schmidt By Zach Schmidt
& Neekaan Oshidary& Neekaan Oshidary
Light: A Particle or WaveLight: A Particle or Wave
Different tests support different Different tests support different sides of the argumentsides of the argument
Today: dual theoryToday: dual theory Young ExperimentYoung Experiment
Double Slit AnalogyDouble Slit Analogy
Particles Through One SlitParticles Through One Slit
Particles Through Both Particles Through Both SlitsSlits
Interference or Not?Interference or Not?
The ExperimentThe Experiment
Components:Components:Light Source: Lasers Light Source: Lasers Double Slit: Pre-made slitsDouble Slit: Pre-made slitsDetector: Smooth surfaceDetector: Smooth surface
INTERFERENCE!INTERFERENCE!
Testing VariablesTesting Variables
Distance and Fringe WidthDistance and Fringe Width
w/D=C, DIRECTw/D=C, DIRECT WhereWhere w= fringe widthw= fringe width
D= distance between slits and detectorD= distance between slits and detectorC= constantC= constant
Fringe Width vs. Distance for Slit Seperations
0
5
10
15
20
1 2 3 4
Distance (m)
Fri
ng
e W
idth
(m
m)
0.176 mm
0.35 mm
0.7 mm
Slit Separation and Fringe Slit Separation and Fringe WidthWidth
w w xx s=C, INVERSE s=C, INVERSE WhereWhere w= fridge width w= fridge width
s= slit separations= slit separation
C= constantC= constant
Understanding Inverse Understanding Inverse relation of slit separation relation of slit separation and fringe width.and fringe width.
Wavelength and Fringe Wavelength and Fringe WidthWidth
w/w/C, DIRECTC, DIRECT WhereWhere w=fringe widthw=fringe width
wavelengthwavelength
C= constantC= constant
Recap of relationshipsRecap of relationships
w/D=C, Distance: directw/D=C, Distance: direct w*s=C, Slit separation: inversew*s=C, Slit separation: inverse w/w/=C, Wavelength: direct=C, Wavelength: direct Can we combine these into one larger Can we combine these into one larger
equation?equation?
What about Wavelength?What about Wavelength?
(S (S x x W)/DW)/D
ResultsResults
Helium-neon laserHelium-neon laser Our calculation: 610.5 nmOur calculation: 610.5 nm Real value: 632.5Real value: 632.5 Percent Error: 3.5%Percent Error: 3.5%
Particle Nature of LightParticle Nature of Light
Light consists of bundles of energy Light consists of bundles of energy called photonscalled photons
What would happen if we slowed What would happen if we slowed down the laser, so only one photon down the laser, so only one photon at a time arrived at the slits?at a time arrived at the slits?
Does This Make Any Does This Make Any Sense?Sense?
ConclusionConclusion
Light behaves like a wave; Light behaves like a wave; interferenceinterference
We used this property to calculate We used this property to calculate the wavelength of lightthe wavelength of light
Light also behaves like a particleLight also behaves like a particle This behavior is described in the This behavior is described in the
dual wave/particle theorydual wave/particle theory
THE END!THE END!