# ib chemistry on electromagnetic spectrum and wave particle duality

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IB Chemistry on Electromagnetic Spectrum and Wave Particle DualityTRANSCRIPT

- 1.Tutorial on Electromagnetic Radiation and Wave-Particle Duality.Prepared by Lawrence Kok http://lawrencekok.blogspot.com

2. Electromagnetic Spectrum Electromagnetic spectrum ranges from Radiowaves to Gamma waves. - Form of energy - Shorter wavelength -> Higher frequency -> Higher energy - Longer wavelength -> Lower frequency -> Lower energy 3. Electromagnetic Spectrum Electromagnetic spectrum ranges from Radiowaves to Gamma waves. - Form of energy - Shorter wavelength -> Higher frequency -> Higher energy - Longer wavelength -> Lower frequency -> Lower energyWavelength, - long Wavelength, - short Frequency, fFrequency, f- low - high Inverse relationship between- and f 4. Electromagnetic Spectrum Electromagnetic spectrum ranges from Radiowaves to Gamma waves. - Form of energy - Shorter wavelength -> Higher frequency -> Higher energy - Longer wavelength -> Lower frequency -> Lower energyWavelength, - long Wavelength, - short Frequency, fFrequency, f- low Inverse relationship between- and f- high Electromagnetic radiation Travel at speed of light, c = f -> 3.0 x 10 8 m/s Light Particle photon have energy given by -> E = hf Energy photon - proportional to frequency, fPlank constant proportionality constant bet energy and freqExcellent video wave propagation Click here to view. 5. Electromagnetic Wave propagation. Electromagnetic radiationMoving charges/particles through space Oscillating wave like property of electric and magnetic field Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation.Electromagnetic radiation Electromagnetic wave propagationClick here to view video 6. Electromagnetic Wave propagation. Electromagnetic radiationMoving charges/particles through space Oscillating wave like property of electric and magnetic field Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation.Electromagnetic radiation Electromagnetic wave propagationwaveClick here to view videoWaveWave wavelength and frequency - travel at speed of light 7. Electromagnetic Wave propagation. Electromagnetic radiationMoving charges/particles through space Oscillating wave like property of electric and magnetic field Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation.Electromagnetic radiation Electromagnetic wave propagationwaveClick here to view videoViolet = 410nm f = c/ = 3 x 108/410 x 10-9 = 7.31 x 1014 Hz E = hf = 6.626 x 10-34 x 7.31 x 1014 = 4.84 x 10-19 JWaveWave wavelength and frequency - travel at speed of lightRed = 700nm f = c/ = 3 x 108/700 x 10-9 = 4.28 x 1014 Hz E = hf = 6.626 x 10-34 x 4.28 x 1014 = 2.83 x 10-19 J 8. Electromagnetic Wave propagation. Electromagnetic radiation Moving charges/particles through space Oscillating wave like property of electric and magnetic field Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation. Electromagnetic radiation Electromagnetic wave propagationwaveClick here to view videoWaveWave wavelength and frequency - travel at speed of light 9. Electromagnetic Wave propagation. Electromagnetic radiation Moving charges/particles through space Oscillating wave like property of electric and magnetic field Electric and magnetic field oscillate perpendicular to each other and perpendicular to direction of wave propagation. Electromagnetic radiation Electromagnetic wave propagationwaveClick here to view videoWaveWave wavelength and frequency - travel at speed of lightSimulation on Electromagnetic PropagatinClick here to view simulationClick here to view simulationClick here to view simulation 10. Electromagnetic Wave VioletRed = 410nm = 700nmf = c/ = 3 x 108/410 x 10-9 = 7.31 x 1014 Hzf = c/ = 3 x 108/700 x 10-9 = 4.28 x 1014 HzWavelength Distance bet two point with same phase, bet crest/troughs unit nm Frequency Number of cycle/repeat per unit time (cycles in 1 second) unit Hz 11. Electromagnetic Wave VioletRed = 410nm = 700nmf = c/ = 3 x 108/410 x 10-9 = 7.31 x 1014 Hzf = c/ = 3 x 108/700 x 10-9 = 4.28 x 1014 HzWavelength Distance bet two point with same phase, bet crest/troughs unit nm Frequency Number of cycle/repeat per unit time (cycles in 1 second) unit HzWhich light wave have higher frequency, if both have same speed reaching Y same time? Violet lightXYRed light 12. Electromagnetic Wave VioletRed = 410nm = 700nmf = c/ = 3 x 108/410 x 10-9 = 7.31 x 1014 Hzf = c/ = 3 x 108/700 x 10-9 = 4.28 x 1014 HzWavelength Distance bet two point with same phase, bet crest/troughs unit nm Frequency Number of cycle/repeat per unit time (cycles in 1 second) unit HzWhich light wave have higher frequency, if both have same speed reaching Y same time? Violet lightXClick here on excellent video red /violet waveClick here to view video energy photonY Light travel same speed Red flippers long - less frequent Violet shoes short - more frequentRed light 13. Quantum Weirdness Is Light/electron a Wave or Particle? Pass BIG particles through a 2 slitPass waves through a 2 slit2 bandsParticle gunSlitInterference patterns of many bands 14. Quantum Weirdness Is Light/electron a Wave or Particle? Pass BIG particles through a 2 slitPass waves through a 2 slit2 bandsParticle gunInterference patterns of many bandsSlitQuantum particles small particles, like electrons Is light/electron a Wave or Particle?ParticlesPass electron through a 2 slitDoes electron behave asClick here to view simulationInterference patterns of many bandsWaves 15. Quantum Weirdness Is Light/electron a Wave or Particle? Pass BIG particles through a 2 slitPass waves through a 2 slit2 bandsParticle gunInterference patterns of many bandsSlitQuantum particles small particles, like electrons Is light/electron a Wave or Particle?ParticlesPass electron through a 2 slitParticles /photon single slit single band double slit double bandDoes electron behave asClick here to view simulationInterference patterns of many bandsWavesWave Crest/trough appearing Double slit interference behind screen bright/dark bands 16. Quantum Weirdness Is Light/electron a Wave or Particle? Pass BIG particles through a 2 slitPass waves through a 2 slit2 bandsParticle gunInterference patterns of many bandsSlitQuantum particles small particles, like electrons Is light/electron a Wave or Particle?ParticlesPass electron through a 2 slitParticles /photon single slit single band double slit double bandDoes electron behave asClick here to view simulationInterference patterns of many bandsWavesWave Crest/trough appearing Double slit interference behind screen bright/dark bandsConclusion Single electron behave like particles but travel like a waveWavesPrinciple of waveparticle duality. 17. Quantum Weirdness Is Light/electron a Wave or Particle?Pass electron through a 2 slitParticlesDoes electron behave asClick here to view simulationInterference patterns of many bandsWaves 18. Quantum Weirdness Is Light/electron a Wave or Particle?Pass electron through a 2 slitParticlesParticles/photon single slit single band double slit double bandDoes electron behave asClick here to view simulationInterference patterns of many bandsWavesWaves Crest/trough appearing Double slit interference behind screen bright/dark bands 19. Quantum Weirdness Is Light/electron a Wave or Particle?Pass electron through a 2 slitParticlesParticles/photon single slit single band double slit double bandDoes electron behave asClick here to view simulationInterference patterns of many bandsWavesPass electron through a 2 slit ParticlesDoes electron behave asMeasuring /observing it - which slit it passes throughWavesWaves Crest/trough appearing Double slit interference behind screen bright/dark bands 20. Quantum Weirdness Is Light/electron a Wave or Particle?Pass electron through a 2 slitParticlesParticles/photon single slit single band double slit double bandDoes electron behave asClick here to view simulationInterference patterns of many bandsWavesPass electron through a 2 slit ParticlesWaves Crest/trough appearing Double slit interference behind screen bright/dark bandsParticles/photon single slit single band double slit double bandDoes electron behave asMeasuring /observing it - which slit it passes throughWavesWaves Crest/trough appearing Double slit interference behind screen bright/dark bands 21. Quantum Weirdness Is Light/electron a Wave or Particle?Pass electron through a 2 slitParticlesParticles/photon single slit single band double slit double bandDoes electron behave asClick here to view simulationInterference patterns of many bandsWavesPass electron through a 2 slit ParticlesWaves Crest/trough appearing Double slit interference behind screen bright/dark bandsParticles/photon single slit single band double slit double bandDoes electron behave asMeasuring /observing it - which slit it passes throughWavesWaves Crest/trough appearing Double slit interference behind screen bright/dark bandsConclusion Single electron behave like particle but travel like a waveTry to measure it.Principle of waveparticle duality. Wave of possibility. 22. Is light a Wave or Particle? Photoelectric effect Light hits metal Electrons are release (photoelectrons) Current measured Click here to view video 23. Is light a Wave or Particle? Photoelectric effect Light hits metal Electrons are release (photoelectrons) Current measured Click here to view videoLight Shows photoelectric effectShine light to metalCurrent measuredIs Light a Wave or Particle?Is Light a Wave or Particle?Wave TheoryParticle TheoryVS Click here to view video 24. Is light a Wave or Particle? Photoelectric effect Light hits metal Electrons are release (photoelectrons) Current measured Click here to view videoLight Shows photoelectric effectShine light to metalCurrent measuredIs Light a Wave or Particle?

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