01_22_Light_Interference

01_22_Light_Interference - Today 1/22 o Light Interference...

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Today 1/22 o Light Interference: read Text 27.1,2 o HW: 1/22 Handout “Interference (more than one frequency)” due Friday 1/24 o Today: Questions? Example Problem Young’s Double Slit experiment o Peer Guidance Center Begins Wed afternoon Wit 209
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A little review o Waves o Two types, transverse and longitudinal o Wave speed depends only on the medium o Period, Frequency, Amplitude--just like SHM o v = λ f o Interference o Superposition-- adding waves o It’s all about Path Length Difference, λ , and.. o Sources “in” or “out” of “Phase”
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Example: Two sources emit in phase What is the lowest frequency of sound that will produce destructive interference here? PL 1 = 2.0m PL 2 = 2.2m
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Young’s Double Slit (like two speakers) Single frequency source Wave crests λ Wave troughs Dark and bright “fringes” on a screen In phase at the slits c c c c c d d d d
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Young’s Double Slit (like two speakers) Single frequency source Wave crests λ Wave troughs Does the pattern expand or contract when: -the slits move closer together?
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