Lecture_04 - PHYS 342 Fall 2010 Lecture 04 The...

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PHYS 342 Fall 2010 Lecture 04: The Wave-Particle Duality Previous discussion focused on “particle” nature of light. What is evidence that light is a wave? Lecture 04 Ron Reifenberger Birck Nanotechnology Center Purdue University 1
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Side view! Not to scale! Monochromatic Light Source Interference Effect for Light x Top view! 2
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Young’s Double Slit Geometry screen screen α α a) b) θ θ near screen far screen c) as distance to screen increases, α0 (α=0 is the limiting condition for parallel rays ) θ θ θ d two parallel rays Top view! 3
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far screen condition θ θ θ d two parallel rays d sin( θ ) Top view! A B C D E ( ) , sin 2 2 sin 2 constructive interference when sin Path Difference but Path Difference d phase change path difference d n D ABC AB BC d n BC E E A DE D B θ π λ π θ π λ λ θ = - = - = = = = × = = + = 4
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Young’s double slit was discovered in 1803. Any similar phenomena reported since then? Experiments around 1900 with X-rays 5
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X-ray diffraction from solid materials ( circa 1912) X-rays
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