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Lecture3

# Lecture3 - Physics7CSSII Lecture4:Interference Agenda Quiz...

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Physics 7C SSII Lecture 4: Interference

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Agenda Quiz 2 Quick Review of Interference Basics Answer any 1D interference questions More on single source 2D interference Introduce time-dependent interference (beats) Introduce standing waves
Please remember to write your  section! Section DL Times TA 1 WF 10:30-12:50 Ryan James 2 MW 2:10-4:30 Andy Scacco 3 MW 4:40-7:00 Daniel Phillips 4 MW 7:10-9:30 Marius Millea 6 TR 10:30-12:50 Charles Pierce 7 R 2:10-4:40 Daniel Phillips M 10:30-12:50 8 TR 4:40-7:00 Jeremy Mock 9 TR 7:10-9:30 Jeremy Mock 11 TF 2:10-4:30 Chris Westenburger

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Interference Fundamentals ΔΦ = …-4π, -2π, 0, 2π, 4π…. → constructive ΔΦ = …-3π, -π, π, 3π…. → destructive ΔΦ = anything else → partial 2πΔ(t/T) ±2πΔ(x/λ) Δφ ΔΦ Interference W1 – W2 C, D, or P Simplified Phase Chart
Back to 2D Interference d Two slits create two overlapping wave fronts Crest Trough

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2D Interference: Single Source When we have a single source illuminating two slits, we know that the interference pattern only depends on Δx!
Δx is often very hard to measure (You will see this in DL for laser light). In DL, you will use another approach to find Δx.

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Lecture3 - Physics7CSSII Lecture4:Interference Agenda Quiz...

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