l14 - Today HW 6 due 4pm Friday 3/5(note change Schedule...

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ISP209s10 Lecture 16 -1- Today HW 6 due 4pm Friday 3/5 (note change!) Schedule changes (revised lecture schedule on the website later today or tomorrow) Light as a wave phenomena Intro to Quantum mechanics
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ISP209s10 Lecture 16 -2- A wave travels along a Slinky. But what is traveling? It’s the shape that travels, and it carries energy with it. The shape – or disturbance – is the wave, and the Slinky is the medium through which the wave travels. Waves: Something else that travels
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ISP209s10 Lecture 16 -3- Waves: Something else that travels Wave moves radially outward from a dropped pebble. The “medium” is The water.
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ISP209s10 Lecture 16 -4- Interference: a unique feature of waves What happens when 2 waves meet?
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ISP209s10 Lecture 16 -5- Interference: a unique feature of waves What happens when 2 waves meet? “Wave Interference”: the 2 wave forms are superimposed Afterwards, the 2 original wave forms continue on undistorted. Compare to two cars meeting! Weird, huh?
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ISP209s10 Lecture 16 -6- Interference: a unique feature of waves “Destructive Interference”: 2 waves meet and “cancel” Each other
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ISP209s10 Lecture 16 -7- Interference: a unique feature of waves “Constructive Interference”: 2 waves meet and “reinforce” eachother
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ISP209s10 Lecture 16 -8- Interference: a unique feature of waves A single oscillating “source” of water waves at point A Black lines = “crests” In between = “valleys” What happens if you add an identical “source” at a different point?
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ISP209s10 Lecture 16 -9- Interference: a unique feature of waves X = constructive interference (2 crests overlap) O = destructive interference (1 crest and 1 valley overlap)
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ISP209s10 Lecture 16 -10- Interference: a unique feature of waves X X X X
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