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D uality

D uality. P article. Wave-. Done By : Li Chen Yi Class/index: 2O221. Wave-particle duality. What is wave-particle duality? A property of light where it can be a wave and a particle at the same time. Wave-particle duality. Wave.

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D uality

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  1. Duality Particle Wave- Done By : Li Chen Yi Class/index: 2O221

  2. Wave-particle duality • What is wave-particle duality? • A property of light where it can be a wave and a particle at the same time.

  3. Wave-particle duality

  4. Wave • Light is actually an electrometric wave, visible light, ultraviolet light and infrared light is actually electrometric wave of different frequencies.

  5. Milestones • Huygens and Newton. • Huygens • Earliest comprehensive on the theory of light, proposed that light is a wave • Was soon overshadowed by Isaac Newton • Isaac Newton • Proposed that light consisted of small particles • Explained refraction and rainbow, • Particle viewpoint remained unchallenged for a century

  6. Milestones • Young, Fresnel and Maxwell • Young, Maxwell • Double-slit experiment helped prove Huygens’ theory about light being a wave. • Maxwell • Explained light as electromagnetic waves

  7. Milestones • Planck • Came up with a formula which Is later used in Einstein's equation.

  8. Milestones • Einstein • Provided an explanation for the photoelectric effect

  9. Double-slit • A experiment whereby a laser beam is shone through a double silt plate. • Proves that light is a wavelenght

  10. Double-slit • If light is a particle, the image shone on the screen would follow the pattern of the plate, but instead it do not ( refer to single and double slit) • The patterns become much wider and detailed. • It is inferred that light is a Wave length

  11. Photoelectric Effect • Properties • Electrons were emitted immediately (no time lag) • Increasing light intensity increased the number of photoelectrons but not their maximum kinetic energy • No matter the intensity, red light will not cause ejection of electrons • Weak violet light would eject few electrons but have greater kinetic energy

  12. Photoelectric Effect • Explanation • Higher-frequency photons have more energy and thus makes electron fly out with a higher speed. • Switching to a light with higher frequency would increase the maximum kinetic energy an electron would have • Higher intensity light would knock out more electrons. • higher intensity would result in more photons and thus more electrons

  13. Photoelectric Effect • Red light would not cause the ejection of any electron as the photons does not have enough energy to knock the electron out. • Thus light behaves as a particle in this case • The Einstein equation • E= hf • E energy, h6.626 x 10-34 j seconds , f frequency of lgiht

  14. Sources • http://en.wikipedia.org/wiki/Double-slit_experiment • http://hyperphysics.phy-astr.gsu.edu/hbase/mod1.html • http://www.colorado.edu/physics/2000/quantumzone/photoelectric2.html • http://en.wikipedia.org/wiki/Wave%E2%80%93particle_duality#Brief_history_of_wave_and_particle_viewpoints

  15. Thankyou

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