BRIEF HISTORY O(1).pdf Science 7 quarter

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1. WEEK5:CHARACTERISTICOFLIGHT
Grade- 7 Archimedes
3rd Quarter
Science 7

2. BRIEF HISTORY OF LIGHT


ISAAC NEWTON
"LIGHT BEHAVES LIKE A PARTICLE"

3. CHRISTIAN HUYGENS
"LIGHT BEHAVES LIKE A WAVE"

4. LOUIE DE BROGLIE
"LIGHT CAN BE A PARTICLE AND A WAVE "

5. JAMES CLERK MAXWELL
"ELECTROMAGNETIC THEORY OF LIGHT"

6. WHAT IS LIGHT?
-IS A FORM OF ENERGY THAT TRAVELS
THROUGH AN ELECTROMAGNETIC WAVE

7. THREE TYPES OF LIGHT:
•
•
•
TRANSPARENT MATERIAL
ALLOWS LIGHT TO GET THROUGH
TRANSLUCENT MATERIAL
PARTY ALLOW LIGHT TO GET THROUGH
OPAQUE MATERIAL
DO NOT ALLOW LIGHT TO PASS THROUGH

8. PROPERTIES OF LIGHT
1.
2.
3.
REFLECTION
ABSORPTION
TRANSMISSION

9. SOURCE OF LIGHT




NATURAL - source of lights that are present
naturally in the universe and are not made by
humans

ARTIFICIAL- man - made source of light

LUMINOUS - light that emit their own light

NONLUMINOUSdonottheirownlight

10. CHARACTERISTICS OF LIGHT
INTENSITY
refers to the strength or amount of light
produced by a specific lamp source
The measure of the wave - length weighted
power by a light source .
defined to be power per unit area.
Watt (W) per square meter (m²)

11. TYPES OF ELECTROMAGNETIC
RADIATION.
Radio - used to broadcast radio and television.
Microwaves - used in cooking, radar, telephone,
and other signal.
Infrared - transmits heat from sun,,fires, radiators.
Visible Light - make things able to be seen.
Ultraviolet - absorbed by the skin used in
fluorescent tube.
X-rays - used to view inside of bodies and
objects.
Gamma - rays - used in medicine for killing
cancer cells.

12. ACTIVITY 1:
Light a. Do not their own light.
Natural b. Man made source of light.
Artificial c. Is a form of energy that
travels though an
electromagnetic wave.
Luminous d. Light that present naturally in
the universe and are not made
by humans.
Non luminous e. Light source that emit their
own light.
A B

13. Answer key:
Activity 1 :
1.c
2.d
3.b
4.e
5.a