THE NATURE OF LIGHT
ACTIVITY


With a partner, list down all the possible sources
of light.
MAYBE YOU HAVE THOUGHT OF…
LIGHT PRECEDES SIGHT
THEN WHAT IS
LIGHT?
BEFORE WE DEFINE LIGHT…
Let’s talk about the electromagnetic spectrum
 Trace the historical development of the theories
t...
A REVIEW OF
ELECTROMAGNETIC WAVES
These are waves
produced by oscillating
charges.
 They can travel through
a vacuum or m...
THE ELECTROMAGNETIC
SPECTRUM
A CLOSER VIEW ON THE EM
WAVES
RADIO WAVES
These include TV signals
and AM and FM radio
signals.
 They have the longest
wavelength in the
electromagneti...
MICROWAVES
EM waves that have
wavelengths in the range
of centimeters.
 They are used to carry
communication signals
over...
INFRARED WAVES
EM waves that have
wavelengths slightly
longer than wavelengths
of red visible light.
 The warming effect ...
ULTRAVIOLET WAVES
Invisible waves that lies
just beyond the violet
light
 Has higher energy and
frequency but shorter
wav...
X-RAYS
EM waves with
wavelengths less than
10-8 m
 Highly useful in medical
imaging
 Contain a lot of energy
that may gi...
GAMMA RAYS
EM waves with the
highest energy and
frequency
 Shortest wavelength
 Most penetrating
 Exposure to these ray...
THE NATURE OF LIGHT
DEBATES ON THE NATURE OF
LIGHT
Particle or Corpuscular Theory
 Wave Theory of Light
 Dual Nature of Light

Light behaves
as a
PARTICLE.
EVIDENCES FOR WAVES
THOMAS YOUNG AND THE
DOUBLE SLIT EXPERIMENT
POLARIZATION OF LIGHT
EVIDENCE FOR PARTICLES
PHOTOELECTRIC EFFECT
THE DUAL NATURE
OF LIGHT
LOUIS DE BROGLIE
LIGHT HAS DUAL NATURE
The nature of light
The nature of light
The nature of light
The nature of light
The nature of light
The nature of light
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The nature of light

  1. 1. THE NATURE OF LIGHT
  2. 2. ACTIVITY  With a partner, list down all the possible sources of light.
  3. 3. MAYBE YOU HAVE THOUGHT OF…
  4. 4. LIGHT PRECEDES SIGHT
  5. 5. THEN WHAT IS LIGHT?
  6. 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. 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. 8. THE ELECTROMAGNETIC SPECTRUM
  9. 9. A CLOSER VIEW ON THE EM WAVES
  10. 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. 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. 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. 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. 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. 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. 16. THE NATURE OF LIGHT
  17. 17. DEBATES ON THE NATURE OF LIGHT Particle or Corpuscular Theory  Wave Theory of Light  Dual Nature of Light 
  18. 18. Light behaves as a PARTICLE.
  19. 19. EVIDENCES FOR WAVES
  20. 20. THOMAS YOUNG AND THE DOUBLE SLIT EXPERIMENT
  21. 21. POLARIZATION OF LIGHT
  22. 22. EVIDENCE FOR PARTICLES
  23. 23. PHOTOELECTRIC EFFECT
  24. 24. THE DUAL NATURE OF LIGHT
  25. 25. LOUIS DE BROGLIE
  26. 26. LIGHT HAS DUAL NATURE
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