# Lecture17 - ANNOUNCEMENTS Survey Now Running on Course Web...

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ANNOUNCEMENTS Survey Now Running on Course Web Page Until Saturday May 16. New Tycho and WebAssign Should Appear Soon Clicker Score Update Through Last Week Should Appear Soon in Gradebook Under Clicker Points “LS2” Exam #2 Average Looks Higher then Exam 1

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Q1: 600 nm LIGHT ILLUMINATES TWO THIN SLITS SEPARATED BY 0 . 03 mm. WHAT IS THE DISTANCE ON THE SCREEN (3.0 m AWAY) TO THE 2 ND BRIGHT STRIPE FROM THE CENTERLINE? A. 6 . 3 cm B. 12 cm C. 18 cm D. 24 cm E. NONE OF THE ABOVE
THIN FILMS PHASE DIFFERENCE CAUSED BY TWO THINGS: 1. PATH DIFFERENCE ( 2t ) 2. REFLECTION CAN CAUSE 180 ° PHASE CHANGE IN SOME CIRCUMSTANCES BRIGHT: 2t = m λ material * * ONLY IF REFLECTION DOES NOT CAUSE PHASE DIFFERENCE NOTE: λ material = λ / n

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Q2: WHAT IS THE THINNEST FILM OF BENZENE (n = 1.50) ON WATER (n = 1.33) THAT, FOR λ = 500 nm, WILL CAUSE BRIGHT REFLECTION ? A. 83.3 nm B. 125 nm C. 167 nm D. 250 nm E. NONE OF THESE
PHASORS SINUSOIDAL FUNCTIONS MAY BE THOUGHT OF AS A PROJECTION OF UNIFORM CIRCULAR MOTION REPRESENT WAVE AS A ROTATING “PHASOR” B(x,t) = B 0 sin (kx - ϖ t) PICK FIXED x, LET t VARY ϖ t B 0

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PHASOR ADDITION TWO WAVES AT THE SAME POINT “x” AS TIME VARIES: ϖ 1 t B 1 ϖ 2 t B 2 B 1 B 2 B NET
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## This note was uploaded on 06/07/2009 for the course PHYS 123 taught by Professor Boynton during the Spring '09 term at University of Washington.

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Lecture17 - ANNOUNCEMENTS Survey Now Running on Course Web...

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