class34 - What were we doing last class Texting Todays...

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More about quantum tunneling and a brief review of waves E electron What were we doing last class? No! (Of course not!) We were talking about how an electron in a short wire could flow across a gap into a very long wire: Texting? If very very long Wire#2 gets closer and closer to our short wire#1, what will happen? 0 L Wire#1 Wire# b there is a probability the electron will flow away through wire 2 t 2 >t 1 E electron t 1 V(x) ψ (x) t 3 >t 2 Electron flows away Ψ(x,t): standing wave Ψ(x,t): traveling wave Review: Standing waves vs. traveling waves Typical form of a traveling wave Traveling wave in space (along x-axes): ) sin( ) , ( t kx A t x E ω = x t 1 x t 2 >t 1 t 3 >t 2 x Review: Standing waves vs. traveling waves Typical form of a standing wave Standing wave in space (along x-axes): ) sin( 2 ) sin( 2 ) cos( ) sin( ) , ( t kx A t kx A t kx A t x E + + = = x x t 2 x Wave (& hence zero crossing) is stationary
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This note was uploaded on 08/24/2010 for the course PHYS 2130 taught by Professor Staff during the Spring '08 term at Colorado.

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class34 - What were we doing last class Texting Todays...

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