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Lecture 3 SSI 10 Pre Lecture

# Lecture 3 SSI 10 Pre Lecture - Physics7CSSI2010...

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Physics 7C SSI 2010 Lecture 3: Wave Interference

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Today’s Agenda Review of Interference Basics and superposition of 1D waves (as studied in DL 04) Introduction to interference patterns resulting from 2D wave superposition Quiz 1
Interference Basics y tot (x,t) = y 1 (x,t) + y 2 (x,t) Interference occurs when two waves occupy the same space at the same time. What does the resultant “total” wave look like? Note: Right now we are only considering the case where the two waves have identical frequencies.

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Interference Basics Three possibilities 1) Constructive Interference 2) Destructive Interference 3) Partial Interference Anything in between!
Superposition of Sound Waves Greater pressure fluctuations More & less intense means louder and softer +

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Superposition of Sound Waves Amplitude is zero + No more pressure fluctuations No sound!
Interference Basics Q) How do we determine if there is constructive, destructive or partial interference? A) Figure out the total phase difference! Waves are “in phase”: ΔΦ = (even number)*π → Constructive interference Waves are “out of phase”: ΔΦ = (odd number)*π → Destructive interference Neither “in phase” nor “out of phase” → Partial interference

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Phase Charts for Interfering Waves Phase charts help us determine ΔΦ! 2πt/T ± 2πx/λ φ Φ Unit circle Wave 1 Wave 2 Difference
Simplified Phase Chart 2πΔ(t/T) ±2πΔ(x/λ) Δφ ΔΦ Interference W1 – W2

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Lecture 3 SSI 10 Pre Lecture - Physics7CSSI2010...

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