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”
Example: What is the lowest frequency of sound that will produce destructive interference here?

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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
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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## This note was uploaded on 12/21/2010 for the course PHYS Physics 21 taught by Professor Larrywatson during the Spring '08 term at North Dakota.

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

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