PRESENTER: GUNDAYAO, CLIDORO, ALGAMON and ENRIQUEZ M.
11- ABM 1_PHYSICAL SCIENCE
TARGETS:
✎
✎
✎
Identify the properties of photons;
Describe the history of the discovery of photons; and
Explain how the relationship between the energy Of a photons
and its frequency can be used to explain why red light is used in
photogenic dark rooms, why we get easily sunburned in
ultraviolet light but not in visible light and how we see colors.
PHOTON
Photons are a bundle of
electromagnetic energy. It is
the basic unit that makes up
all light.
PROPERTIES
OF PHOTONS
PRESENTER: SOPHIA GRACE GUNDAYAO
PROPERTIES OF PHOTONS
This are the properties of photons
Photons have zero mass and rest
energy. It only exists as particles in
motion.
Photons are stable.
Photons are elementary particles
even if it has lack of rest mass.
Photons are spin-1 particles which
converts them bosons.
Photons can interact with other
particles like electrons in the Compton
Effect.
Photons can be destroyed or created by
different natural means, for example
when radiation is absorbed or ejected.
Photons have zero electric charge.
Photons have energy and momentum
which are dependent on its frequency.
Photons travel as fast as speed of light
when in empty space.
HISTORY OF
PHOTONS
PRESENTERS: MICHAELA ALGAMON & SARAH MARIE CLIDORO
In the late 1800s
- proposed his theory of
electromagnetism, which
described the interactions
between electric and magnetic
fields.
JAMES CLERK MAXWELL
In the early 1900s
- made further contributions to the
understanding of light and the
photon. In 1905, he proposed that
light was made up of packets of
energy, which he called “quanta.” He
showed that the energy carried by
each quantum was proportional to
the frequency of the electromagnetic
wave.
ALBERT EINSTEIN
Over the years, the understanding of photons has continued to evolve. In
the 1920s and 1930s, quantum mechanics was developed, which provided
a deeper understanding of the behavior of photons. It showed that particles
like photons could exhibit both wave-like and particle-like properties,
depending on how they were observed. Further research in the mid-1900s
showed that photons could be created and destroyed under certain
conditions. This led to the development of new technologies like lasers and
fiber optics, which use the properties of photons to transmit information
over long distances.
DEFINITION OF TERMS:
QUANTUM
• is the smallest elemental unit of a quantity, or the smallest discrete amount of
something. The plural of quantum is quanta.
ELECTROMAGNETIC WAVE
• Is an energy-carrying wave emitted by a vibrating charge (often electrons) that is
composed of oscillating electric and magnetic fields that regenerate one
another.
LIGHT
• It refers to electromagnetic radiation of any wavelength, whether visible or not.
ENERGY
It is the capacity for doing work.
FREQUENCY
It is the number of waves that pass a fixed point in unit time;
Today, photons continue to play a key
role in our understanding of the
universe. They are used in scientific
research, medical imaging, and
telecommunications, among many
other applications.
HOW THE RELATIONSHIP BETWEEN
THE ENERGY OF A PHOTONS AND ITS
FREQUENCY CAN BE USED TO
EXPLAIN WHY RED LIGHT IS USED IN
PHOTOGRAPHIC DARK ROOMS, WHY
WE GET EASILY SUNBURNED IN
ULTRAVIOLET LIGHY BUT NOT IN
VISIBLE LIGHT AND HOW WE SEE
COLORS.
PRESENTER: MYKAELA ENRIQUEZ
The particle of light and the energy of
photon is DIRECTLY PROPORTIONAL
to its frequency.
ELECTROMAGNETIC SPECTRUM
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Longer Wavelength
Lower Frequency
Lower Energy
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Shorter Wavelength
Higher Frequency
Higher Energy
The relationship between the energy and
frequency that the higher the frequency, the
higher the energy and given by the equation
E = hf
E = Energy
h = Planks Constant
f = Frequency
•
Why RED light is used in photographic
dark rooms?
Darkrooms used red lighting
to allow photographers to
control light carefully, so that
light-sensitive photographic
paper would not become
overexposed and ruin the
pictures during the
developing process.
• Why do we get easily sunburned in
Ultraviolet Light but not in Visible Light?
The energy of photons is proportional to
their frequency. Ultraviolet light has a
higher frequency than visible light
which indicates that it has higher
energy also. This means that UV is
sufficiently energetic to cause skin
damage while visible light is not.
• How do we see colors?
Light travels into the eye to the retina, located
on the back of the eye. The retina is covered
with millions of light receptive cells known as
rods and cones. When these cells detect light,
they send signals to the brain.
These three cones are as
follows:
the L cone is
photosensitive to red
(long wavelength), the M
cone is photosensitive to
green (middle
wavelength) and the S
cone is photosensitive to
blue (short wavelength).