110316 - 1 CHM3400 - Lecture 26 – Mar 16 Foundation of...

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Unformatted text preview: 1 CHM3400 - Lecture 26 – Mar 16 Foundation of quantum mechanics (Chapter 11 401-416) • wave-particle duality: double slit and photoelectron effect expts • quantized energy levels • Hydrogen atom • de Broglie equation • Heisenberg’s Uncertainty principle 2 Wave-particle duality of light Wave : double slit experiment demonstrating interference Particle : photoelectric effect Experiment 3 Electromagnetic wave 4 Wave properties λν = v Velocity (ms-1 ) Wavelength (m) Frequency (Hz, s-1 ) Progressively more destructive interference What does the amplitude represent for photons? 5 Wave : Double slit experiment onochromatic light source Equal distance ⇒ equal phase ⇒ constructive interference ⇒ bright spot ) 2 cos( t πν Phase angle in time: Different distance ⇒ equal phase ⇒ constructive interference ⇒ bright spot ) 2 2 cos( ) 2 cos( π πν πν + = ⇒ t t Different distance ⇒ opposite phase ⇒ destructive interference ⇒ dark spot ) 2 cos( ) 2 cos( π πν πν + − = ⇒ t t B D π 2 1 2 + = B S B S π + = D S D S 2 1 6 Particle : Photoelectric effect E kin = ½ m v 2 ν α energy E = h ν 2 2 1 v m h e + Φ = ν Work function =………....
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This note was uploaded on 05/29/2011 for the course CHM 3400 taught by Professor Seabra during the Spring '08 term at University of Florida.

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110316 - 1 CHM3400 - Lecture 26 – Mar 16 Foundation of...

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