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MODERN PHYSICS APPLICATION IN LIGHT
Transcript of MODERN PHYSICS APPLICATION IN LIGHT
MODERN PHYSICS APPLICATION IN LIGHT
Introduction to Light
Eg : UV light
Made by man
Eg : fluorescent, laser, halogen lamp, L.E.D, etc
Applications of Light
Light Detection and Ranging (LiDAR)
Mechanics, thermodynamics, electricity and magnetism, optics
Atomic and nuclear, quantum mechanics, particle Physics, condensed matter, relativity and cosmology
a way to treat seasonal affective disorder (SAD).
help with other types of depression and sleep disorder.
to increase the effectiveness of antidepressant medication.
HOW IS IT
During light therapy sessions,you sit near or work near
talk to a doctor for advice
look for a light therapy that emits as little UV light as possible
do not use tanning beds as an alternative in light therapy
irritability or agitation
HOW SOLAR CELL WORKS?
(from sunlight) hit the solar panel
are absorbed by semiconducting materials, e.g ; silicon.
cause electrons to be excited from their current molecular/atomic orbital.
The excited electron may either dissipate energy as heat and return to its orbital OR travel through the cell until it reaches an electrode.
Current flows through the material to cancel the potential and this electricity is captured.
An array of solar cells converts solar energy into a usable amount of direct current (DC) electricity.
An inverter can convert the power to alternating current (AC).
FOC – Free of charge
Doesn`t cause pollution
Can be used in remote areas where it is too expensive to extend the electricity power grid.
Many everyday items can be powered by solar energy
e.g : calculators
which converts light energy directly into electricity.
this devise possesses electrical characteristics ;
(very sensitive to light) ; regardless whether it is sunlight or artificial light
; to detect light or other electromagnetic radiation near the visible range or measuring light intensity.
e.g ; infrared detectors
... Building of machine and equipment are costly
… Manufacturing of these machine and equipment in factories cause pollution
… Large areas of land are required to capture the sun energy.
Solar power stations can be built but they do not match the power output of similar sized conventional power stations.
… Solar power charges batteries so that devices can be used at night. the batteries are large, heavy, need storage space, & need to be replaced from time to time.
... Can only be harnessed during daytime and sunny.
LIGHT DETECTION AND RANGING
remote sensing method used to examine the earth's surface
can be measured in 3 different ways:
HOW IS IT DONE?
LiDAR system records the time it takes for the light energy to travel to the ground and back
uses a laser to scan the earth from side to side as the plane flies
ONLY use either green light (532nm) or near infrared light (1062nm) because they reflect strongly after vegetation
2. GPS Retriever
tracks the altitude and X,Y location of the airplane
allows us to figure out where LiDAR reflections are on the ground
3. IMU (Inertial Measurement Unit) System
tracks the tilt of the plane in the sky as it flies
records all the data that the LiDAR collects as it scans the earth's surface
PARTS OF LiDAR SYSTEM
= (Time travel x Speed of light) / 2
= Altitude - Distance
X-ray and gamma ray are exactly same as the nature of light
X-ray and gamma ray have shorter wavelength than light
X-ray and gamma ray can penetrate materials that light cannot
For investigating the structure of matter
Generated about potential applications of rays as an aid in medicine and surgery
X-rays were used little outside the realms of medicine and dentistry
American Society of Mechanical Engineers (ASME) permitted X-ray approval of fusion welded pressure vessels
We still capture a shadow image on film using similar procedures and processes
Electronics and computers allow technicians to now capture images digitally
Technology has evolved allowing radiography to be widely used in numerous areas of inspection
Radiography industry to inspect not only welds and castings, but to radiographically
PROPERTIES OF X-RAY AND GAMMA RAY
Not detected by human senses
Travel in straight lines at the speed of light.
Cannot be changed by electrical or magnetic fields
Can be diffracted to a small degree
Degree of penetration depends on their energy
WHY WE USE MODERN PHYSICS?
provides a wider compared to classical physics.So,there are more accurate picture of behaviour of the universe.
is easier to understand and use so it remains valuable in several situasions.Its directly related to everyday experience.
There are many application of modern physics in light.For example in medicine, a light therapy (photoyherapy) is using for healing.It is a way to treat seasonal affective disorder (SAD) which is type of depression that occurs at a certain time each year usually in the fall or winter by exposure to artificial light.
The light therapy is very helpful to society especially society in UK and Ireland as they are more susceptible to SAD as they are situated in the higher latitudes of the northern hemisphere.
It shows that application of modern physics gives impact to the society and it proves that the important of physics in our daily life.
the system uses the speed of light to calculate the distance between the top of that object andplane
can be used create map because of its high resolution and accuracy
able to predict canopy bulk density and canopy base height
a useful tools when designing and constructing new building