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The nature of light
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The nature of light

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Transcript

  • 1. THE NATURE OF LIGHT
  • 2. ACTIVITY  With a partner, list down all the possible sources of light.
  • 3. MAYBE YOU HAVE THOUGHT OF…
  • 4. LIGHT PRECEDES SIGHT
  • 5. THEN WHAT IS LIGHT?
  • 6. BEFORE WE DEFINE LIGHT… Let’s talk about the electromagnetic spectrum  Trace the historical development of the theories that explain the nature of light 
  • 7. A REVIEW OF ELECTROMAGNETIC WAVES These are waves produced by oscillating charges.  They can travel through a vacuum or material substance.  They are transverse in nature.  There are seven identified classes of electromagnetic waves. 
  • 8. THE ELECTROMAGNETIC SPECTRUM
  • 9. A CLOSER VIEW ON THE EM WAVES
  • 10. RADIO WAVES These include TV signals and AM and FM radio signals.  They have the longest wavelength in the electromagnetic spectrum which may be several kilometers.  They have also the least energy in the family of EM waves. 
  • 11. MICROWAVES EM waves that have wavelengths in the range of centimeters.  They are used to carry communication signals over long distances (space probes).  Also used in cooking. 
  • 12. INFRARED WAVES EM waves that have wavelengths slightly longer than wavelengths of red visible light.  The warming effect of the sun is an example of infrared radiation.  Can be used to produce detailed image of objects (weather forecasting) 
  • 13. ULTRAVIOLET WAVES Invisible waves that lies just beyond the violet light  Has higher energy and frequency but shorter wavelengths compared to visible light.  Has enough energy to pass through clouds.  UV can be used to kill germs and disinfect objects. 
  • 14. X-RAYS EM waves with wavelengths less than 10-8 m  Highly useful in medical imaging  Contain a lot of energy that may give detrimental effects to tissues 
  • 15. GAMMA RAYS EM waves with the highest energy and frequency  Shortest wavelength  Most penetrating  Exposure to these rays may pose danger  Can be used to treat cancer 
  • 16. THE NATURE OF LIGHT
  • 17. DEBATES ON THE NATURE OF LIGHT Particle or Corpuscular Theory  Wave Theory of Light  Dual Nature of Light 
  • 18. Light behaves as a PARTICLE.
  • 19. EVIDENCES FOR WAVES
  • 20. THOMAS YOUNG AND THE DOUBLE SLIT EXPERIMENT
  • 21. POLARIZATION OF LIGHT
  • 22. EVIDENCE FOR PARTICLES
  • 23. PHOTOELECTRIC EFFECT
  • 24. THE DUAL NATURE OF LIGHT
  • 25. LOUIS DE BROGLIE
  • 26. LIGHT HAS DUAL NATURE

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