Physical Science - Wave Properties of Light.pptx

PHYSICAL SCIENCE
BEHAVIOR OF
ELECTRONS AND
WAVE PROPERTIES
OF
LIGHT

OBJECTIVES
At the end of this presentation, you are expected to:
1. cite experimental evidence showing that
electrons can behave like waves(S11/12PS-IVg-64);
2. enumerate the wave properties of light; and
3. differentiate dispersion, scattering,
interference, and diffraction (S11/12PSIVh-65)

0
1
BEHAVIOR OF ELECTRONS AND WAVE PROPERTIES
OF LIGHT
Evidences of Wave-Like
Behavior of Electrons

Is
ELECTRON
a PARTICLE
or a WAVE?

Two famous scientists in the 1600s, Christiaan
Huygens and Isaac Newton were both
working on the theories for the behavior of
light.

Light is a
wave.
Light is made up
of corpuscles
(particles).

Light is a wave
as shown in my
double-slit
experiment.
Thomas Young

Constructive interference vs. Destructive interference

Light is made up
of particles.
Behold! The wave-
particle behavior
of light.
Einstein
Photoelectric Effect

After the wave-particle
dual behavior of
electron in light was
accepted, another
scientist took a leap by
testing the hypothesis
in MATTER.

LET’S REVIEW!
What is MATTER?
Why MATTER
matters?
What are the parts
of an ATOM?

Electrons act
both as
particles and
waves.
Louis de
Broglie
Modern Double-Slit
Experiment

Louis de
Broglie
Modern
Double-Slit
Experiment

LET’S PONDER!
Relate yourself about the dual nature of both
light and electrons (behave like particles and
waves). Was there an instance in your life that
you behave like a particle (making an impact
to other lives) and a wave (being interfered but
not disturbed)?
Perform in a creative way (talk show, drama,
flash news report, etc.).

RUBRICS FOR SCORING
10 8 6 4 2
Creativity
The group
performed an
outstanding
performance
showing creativity.
The group
performed a
satisfactory
performance
showing creativity.
The group
performed a good
performance
showing creativity.
The group
performed a fair
performance
showing creativity.
The group
performed a poor
performance
showing creativity.
Unity
Unity and
understanding is
consistently
present throughout
the performance.
Unity and
understanding is
mostly present
throughout the
performance.
Unity and
understanding is
present but a
member did not
participate.
Unity and
understanding is
mostly present
throughout the
performance.
Unity and
understanding is
poor throughout
the performance.
Concept
The concept of the
performance is
outstanding.
The concept of the
performance is
satisfactory.
The concept of the
performance is
good.
The concept of the
performance is
fair.
The concept of the
performance is
poor.
Confidence
Everyone in the
group shows
excellent
confidence.
Most of the group
shows excellent
confidence.
Half of the group
shows excellent
confidence.
Less than half of
the group shows
excellent
confidence.
None of the group
shows excellent
confidence.

02
BEHAVIOR OF ELECTRONS AND WAVE PROPERTIES
OF LIGHT
Wave Properties of Light

PROPERTIES OF LIGHT
There are 7 basic properties of light:
1.Reflection of light
2.Refraction of light
3.Diffraction of light
4.Interference of light
5.Polarization of light
6.Dispersion of light
7.Scattering of light

What property of light is shown in the pictures?
Reflection of light
Refraction of light
Diffraction of light
Interference of light
Polarization of light
Dispersion of light
Scattering of light
1
2
3
4
5
6 7

What property of light is shown in the pictures?
3 Reflection of light
7 Refraction of light
4 Diffraction of light
5 Interference of light
2 Polarization of light
6 Dispersion of light
1 Scattering of light
1
2
3
4
5
6 7

03
Dispersion
Interference 04 Diffraction
Wave Properties of Light
01
02
Scattering

The separation of visible light into its different colors
(ROYGBIV) is known as dispersion.
Dispersion

Diffraction is the bending of light around corners such that
it spreads out and illuminates areas where a shadow is
expected.
Diffraction

Interference of light is the phenomena of multiple light
waves interfering with one another under certain
circumstances, causing the combined amplitudes of the
waves to either increase or decrease.
Interference

Interference Constructive Interference
Destructive Interference

Interference
Constructive Interference
This results when the waves arrive together at a point in
phase, that is, crest to crest or trough to trough. The result
is a reinforced wave of amplitude equal to the sum of the
amplitudes of the two waves.

Interference
Destructive Interference
This results when the waves arrive together at a point 1800
out of phase, that is crest to trough. The resultant wave is
of a lesser amplitude equal to the difference of the
amplitudes of the individual waves.

Scattering is the process in which air molecules absorb
sunlight and reemit in various directions.
Scattering

—Oprah Winfrey
“Know what sparks the light in you.
Then use that light to illuminate
the world.”

PHYSICAL SCIENCE
Various
LIGHT
Phenomena

Why is our reflection on the concave and convex sides of
a spoon looks different?
How mirages are formed?
Why does light from a red laser passes more easily though
red cellophane than green cellophane?
Why does clothing of certain colors appear different in
artificial light and in sunlight?
What are haloes, sundogs, primary rainbows, secondary
rainbows, and supernumerary bows and how are they
formed?
Why clouds are usually white and rainclouds dark?
Why the sky is blue and sunsets are reddish?
S11/12PS-IVh-66

Why is our reflection on the concave and convex sides of
a spoon looks different?
The shiny spoon is like a mini mirror, but with a curve in
it. The front of the spoon is a CONCAVE surface, and the
back is a CONVEX surface.

A mirage is an optical phenomenon that creates the
illusion of water and results from the refraction
(bending) of light through a non-uniform medium.
Mirages are most commonly observed on sunny days when
driving down a roadway.
How mirages are formed?

Green cellophane will only allow green light to pass through it.
The cellophane absorbs other colors of light. For example, green light
will not pass through red cellophane. The green light is absorbed by
the red cellophane. However, green light will pass through green
cellophane. As a general rule each color filter (e.g. glass or cellophane)
will only allow light of its own color to pass through.
Why does light from a red laser passes more easily though
red cellophane than green cellophane?

A halo is a ring of light surrounding the sun or moon. Most halos
appear as bright white rings but in some instances, the dispersion of
light as it passes through ice crystals found in upper level cirrus
clouds can cause a halo to have color.
What are haloes, sundogs, primary rainbows, secondary rainbows, and
supernumerary bows and how are they formed?

Sundogs, also known as mock suns or "parhelia", are a pair of
brightly colored spots, one on either side of the sun.

Rainbows result from refraction of sunlight in falling water droplets
plus reflection of the light from the back of the droplet.

As the droplets get smaller, red weakens. In fine mist, all colors
except violet may disappear.

The secondary rainbow is about 10° further out from the antisolar
point than the primary bow, is about twice as wide, and has its colors
reversed.

Why clouds are usually white and rainclouds dark?
Rain clouds scatters more sunlight because they have
bigger water droplets. This means that less light from
the Sun reaches the bottom of the cloud, giving a gray
appearance.

When incoming sunlight encounters a heavy
concentration of particles in the atmosphere, the
shorter wavelengths of light (violet and blue) are
scattered away, resulting in a red sunset. Red sunsets are
often observed from a beach because of the high
concentration of salt particles suspended in the air

1. The blue color of the sky is due to:
A. selective scattering of visible light by air
molecules.
B. the filtering effect of water vapor in the
earth's atmosphere.
C. reflection of sunlight off the earth's
oceans.
D. transmission of visible light through the
ozone layer in the earth's
stratosphere.

2. Blue skies occur during the day due
to:
A. Diffraction
B. Mie scattering
C. Rayleigh scattering
D. Tyndall Effect

3. The following correctly explains light passing
through a cellophane except:
A. As white light passes through red cellophane, the
cellophane absorbs all colors except red.
B. Green light can’t easily pass through green
cellophane because it shows the same color.
C. A red light passing through red cellophane will
simply go through since they have the same color.
D. Red light can’t easily pass through green
cellophane since the cellophane absorbs the red
light.

4. This side of the spoon gives you an
inverted reflected image.
A. Concave
B. Convex
C. Mirage
D. Halo

5. What causes a mirage?
A. scattering of light by air molecules.
B. the bending of light by air of different
densities.
C. a thin layer of moist air near the
ground.
D. reflection of light from a hot surface.

Physical Science - Wave Properties of Light.pptx

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