definition, speed, production, properties of electromagnetic waves and electromagnetic spectrum. waves in EM spectrum and their application in daily life.
Use principles of reflection and refraction to describe how lenses and mirrors work.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
definition, speed, production, properties of electromagnetic waves and electromagnetic spectrum. waves in EM spectrum and their application in daily life.
Use principles of reflection and refraction to describe how lenses and mirrors work.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
Dual Nature of Light, Wave nature of light,Young's double slit experiment, Reflection, Refraction of light, Polarization, Particle Nature of Light, Photoelectric Effect of light ..
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
2. Properties of Light
•
•
•
•
•
•
•
•
•
Effects of Materials on Light
Reflection
Refraction
Dispersion
Total Internal Reflection
Interference
Diffraction
Scattering of Light
Polarization
3. Effects of Materials on Light
Materials can be classified based on how it
responds to light incident on them:
1. Opaque materials – absorb light; do
not let light to pass through
2. Transparent materials – allow light to
easily pass through them
3. Translucent materials – allow light to
pass through but distorts the light
during the passage
4. Reflection
Light follows the Law of Reflection: “The
angle of incidence is equal to the angle of
reflection.”
Light can bounce off materials in two ways:
1. Diffuse reflection – reflected rays go in
different directions; happens in roughtextured or uneven surfaces
2. Regular/Specular reflection – reflected
rays go in one directions; happens in
smooth and shiny surfaces; image can be
seen
5. Refraction
Light bends/refracts when it changes speed.
This usually happens when the light travels
from one medium to the next.
Simple rule of thumb in refraction:
• If light slows down, it will refract towards
the normal line.
• If light speeds up, it will refract away from
the normal line.
6. Refraction
Light travels faster in air, slow in water and
slower still in glass.
The slower light is in a medium, the more it
refracts/bends in it.
The measure of how much light refracts in a
medium is called index of refraction.
Medium
Index of
Refraction (n)
air
1.000293
water
1.3330
glass
1.490
diamond
2.419
7. Refraction
Light follows the Law of Reflection: “The
angle of incidence is equal to the angle of
reflection.”
Light can bounce off materials in two ways:
1. Diffuse reflection – reflected rays go in
different directions; happens in roughtextured or uneven surfaces
2. Regular/Specular reflection – reflected
rays go in one directions; happens in
smooth and shiny surfaces; image can be
seen
8. Refraction
Light follows the Law of Reflection: “The
angle of incidence is equal to the angle of
reflection.”
Light can bounce off materials in two ways:
1. Diffuse reflection – reflected rays go in
different directions; happens in roughtextured or uneven surfaces
2. Regular/Specular reflection – reflected
rays go in one directions; happens in
smooth and shiny surfaces; image can be
seen
9. Dispersion
The process in which
light is separated into
its colors due to the
differences in degrees
of refraction.
How are
rainbow
s
formed?
10. Total Internal Reflection
When light is reflected
completely at the
boundary between
two mediums
How do
fiber
optics
work?
Why do
diamonds
11. Diffraction
Light spreads out after passing through/by
an opening /edge.
The opening must be very narrow for
diffraction of light to occur.
“Every cloud
has a silver
lining.”
14. Reflection
• Reflection - Light bounces off the surfaces
like mirrors such that the angle of
incidence is equal to the angle of
reflection.
• Refraction - Refraction is defined as the
bending of light as it passes through
materials of different optical density
• Interference - When two light waves meet
or coincide, it can create either
constructive or destructive interference
based on how the crests & troughs of the
waves meet.
15. Wave Properties (Light)
• Diffraction - This is defined as the
bending of light waves around
obstacles in its path.
Example, when a light wave passes
through a barrier with a small
opening, it acts as a single point
source from where light emerges
and spreads in all direction.
16. So, is light a wave or a particle?
• Light has a dual nature.
• Depending on the phenomenon or behavior in
question, light can be treated either as a wave
or as a particle.
• To examine this wave-particle duality, we will
examine two experimental proofs.
17. Light is a WAVE: Young’s Double-Slit Experiment
• Conducted by Thomas Young in the early 1800’s
• Provided an experimental basis for considering light as
a wave.
18. Key Points of Young’s Experiment
• The individual slits acted as individual sources
which light passes through and spreads.
(Isn’t this like water waves?)
• Light exhibits interference which is a wave
property.
19. Light is a PARTICLE: The Photoelectric Effect
• Explained by Einstein
during the early 1900’s
• Provided an
experimental basis for
considering light as a
particle.
• Einstein earned a
Nobel Prize for his
explanation.
20. Key Points of Photoelectric effect
• Higher energy light knocks off electrons at higher
energy.
• The number of ejected electrons is directly related to
the intensity (brightness) of light. This means
brighter lights emit more photons.
• Light is a particle since it is capable of ‘knocking off’
electrons. Further, unlike waves, increasing the
brightness does not increase the energy of the
knocked off electrons.
