AIR
ENERGIZED
HEAT
HOT
TIRED
JAN JERICHO C. BATINGA
HEAT
These atoms and molecules are always in
motion, and they have kinetic energy
What is LIGHT?
• Transparent object - the objects that
allow all light rays to travel through.
• Opaque object – the objects that
light cannot pass through.
• Translucent object– the objects that
light pass through them partially
WHO AM I?
Nature of light the theory
supports
Theory of Light
1. Corpuscular Theory
of Light
Scientist who proposed
the theory
Isaac Newton
wave
particle
∕
Wave
and
particle
HOW LIGHT
BEHAVES?
UNDERSTANDING HOW LIGHT BEHAVES
ISAAC
NEWTON
CHRISTIAN
HUYGENS
LOUIS DE
BROGLIE
JAMES CLERK
MAXWELL
“light behaves like a
particle ”
“light behaves like a
wave ”
“light can be a
particle and a
wave”
Dual-Nature of
Light
“light as a
propagating wave
of electric and
magnetic fields”
“corpuscles”
Corpuscular
Theory of Light
Wave Theory of
Light
Electromagnetic
Theory of Light
Bring the following materials by
group on Thursday, March 30
•
•
•
•
•
Cardboard
Sando bag (green, blue, red)
3 flashlights
Button fastener (pushpin/thumbtacks)
Glue and scissor
“Colors of Light – Color of Life!”
Color
Spectrum
Red
Orange
Yellow
Frequency Wavelength
(THz)
(nm)
(× 1012 /𝑠) (× 10−9 𝑚)
422
482
517
Frequency x Wavelength
(m/s)
700
(422 × 1012 /𝑠)(700 × 10−9 m)
295 400 × 103 m/s
3 × 108 m/s
620
(482 × 1012 /𝑠)(620 × 10−9 m)
300, 080 × 103 m/s
3 × 108 m/s
580
(517 × 1012 /𝑠)(580 × 10−9 m)
299, 860 × 103 m/s
3 × 108 m/s
Color
Spectrum
Green
Blue
Violet
Frequency Wavelength
(THz)
(nm)
(× 1012 /𝑠) (× 10−9 𝑚)
566
638
744
Frequency x Wavelength
(m/s)
530
(566 × 1012 /𝑠)(530 × 10−9 m)
299, 980 × 103 m/s
3 × 108 m/s
470
(638 × 1012 /𝑠)(470 × 10−9 m)
299, 860 × 103 m/s
3 × 108 m/s
400
(744 × 1012 /𝑠)(400 × 10−9 m)
297, 600 × 103 m/s
3 × 108 m/s
Color
Spectrum
Red
Orange
Yellow
Green
Blue
Violet
Frequency
(THz)
(× 𝟏𝟎𝟏𝟐 /𝐬)
422
482
517
566
638
744
Wavelength
(nm)
(× 𝟏𝟎−𝟗 𝐦)
700
Frequency x Wavelength
(m/s)
(422 × 1012 /𝑠)(700 × 10−9 m)
𝟐𝟗𝟓 𝟒𝟎𝟎 × 𝟏𝟎𝟑 𝐦/𝐬
620
(482 × 1012 /𝑠)(620 × 10−9 m)
𝟑𝟎𝟎, 𝟎𝟖𝟎 × 𝟏𝟎𝟑 𝐦/𝐬
580
(517 × 1012 /𝑠)(580 × 10−9 m)
𝟐𝟗𝟗, 𝟖𝟔𝟎 × 𝟏𝟎𝟑 𝐦/𝐬
530
(566 × 1012 /𝑠)(530 × 10−9 m)
𝟐𝟗𝟗, 𝟗𝟖𝟎 × 𝟏𝟎𝟑 𝐦/𝐬
470
(638 × 1012 /𝑠)(470 × 10−9 m)
𝟐𝟗𝟗, 𝟖𝟔𝟎 × 𝟏𝟎𝟑 𝐦/𝐬
400
(744 × 1012 /𝑠)(400 × 10−9 m)
𝟐𝟗𝟕, 𝟔𝟎𝟎 × 𝟏𝟎𝟑 𝐦/𝐬
Question
1.
s: Which color
registers the highest frequency? Shortest
wavelength?
2. Which color registers the lowest frequency? Longest
wavelength?
3. What do you observe with the wavelength and frequency of
different colors?
4. What did you observe with the product of wavelength and
frequency for each color? What is the significance of this value?
5. What can you say about the speed of the different colors of
light in air?
6. Give a plausible explanation as to why white light separate
into different colors?
Color Plastic Filters
Color that you see projected on the screen
Green
GREEN
Blue
BLUE
Red
RED
Color Combination
Resulting Color
Green + Blue
CYAN
Blue + Red
MAGENTA
Red + Green
YELLOW
Red + Green + Blue
WHITE
TRIVIA TIME!!!
It takes 499 seconds or
approximately 8 minutes.
TRIVIA TIME!!!
•
It has a speed of 299, 792, 458
8𝑚
meters per second or 3 × 10
𝑠
What is LIGHT?
•
•
It is an electromagnetic wave
It does not need a medium to
propagate
SOURCES OF LIGHT
Natural source of light
Luminous body
Artificial sources of light
An object capable of
producing its own light
LIGHT
DUAL NATURE: particle nature and wave nature
LIGHT
vibration of electric and magnetic field
Visible Spectrum – WHITE LIGHT
PRISM
WHITE LIGHT
DISPERSION – The phenomenon which a prism
separates white light in component colors.
LIGHT
form of energy that travels in
electromagnetic waves
Parts of a wave
CHARACTERISTIC OF
LIGHT
LIGHT INTENSITY
• the power of light
• it is the quantity that measures the
amount of light illuminating a surface
• PHOTOMETRY – the science of
measuring the intensity or brightness of
light.
“Photo” – light
“metry” - measure
LIGHT INTENSITY
BRIGHTNESS
• qualitative expression of light
intensity.
• visual perception in which a light
source appears to be emitting light
or a surface to be reflecting light.
LIGHT INTENSITY
LUMINOUS INTENSITY
• it is the amount of light that the
objects produce
• candela (cd)
LIGHT INTENSITY
The brightness of light depends on
how far you are from the source.
LIGHT INTENSITY
The closer you are to the source of light,
the brighter is the light that you will see.
LIGHT INTENSITY
If you are farther from the source, the
dimmer is the light that you will see.
LIGHT INTENSITY
The intensity of light depends upon the
amount of light or the number of photons
that pass a certain area or space.,
LIGHT INTENSITY
The higher amplitude corresponds to a
brighter light while the lower amplitude
corresponds to dimmer light.
COLOR
COLOR
COLOR
Wavelength range
400 nanometers to 750 nanometers
COLOR
As the wavelength increases,
the frequency decreases.
COLOR
In terms of Wavelength
Red has the longest wavelength, and
violet has the shortest wavelength
COLOR
In terms of Frequency
Violet has the highest frequency, and
Red has the lowest frequency
COLOR
• Frequency
and
Wavelength
are
inversely proportional
• The color white represents the
combination of all the wavelengths of
visible light, while black is the absence
of the wavelength
THANK YOU FOR LISTENING!
ALTERNATIVE RESOURCES