Electromagnetic waves are formed by vibrating electric charges and can transfer energy through space by vibrating electric and magnetic fields. They include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays and gamma rays. All objects emit EM waves depending on their temperature, and the waves have different properties depending on their frequency and wavelength. Radio communication systems like radio, television, cell phones and satellites transmit information by modulating EM carrier waves.
What are electromagnetic wavesSolutionWe are encompassed by w.pdfdeepaksatrker
What are electromagnetic waves?
Solution
We are encompassed by waves we can see and listen, from sea waves to sound waves. A wave
demonstrates the exchange of vitality, from the wind that begins a sea wave to the sound that
travels through the air to your ear drum. Waves that go through a physical protest or medium are
called mechanical waves. Dissimilar to mechanical waves, electromagnetic waves needn\'t
bother with a medium to travel or spread. Electric and attractive fields both deliver vibrations
and, together, the two sorts of vitality make electromagnetic waves.
Waves take distinctive shapes, yet electromagnetic waves all have a snake-like shape, which
makes them transverse waves. Transverse waves are measured by their tallness, or sufficiency,
and by their wavelength, or the separation between the most astounding purpose of one wave, the
peak, to the peak of the following wave. The most reduced purpose of a wave is known as a
trough. Trough to trough can be measured, as well. While dissecting an electromagnetic wave,
both the plentifulness and separation between waves is measured.
One entire wave, from peak to peak, or trough to trough, is known as a cycle. The quantity of
cycles that happen every second is the wave\'s recurrence. Out of appreciation for Heinrich
Hertz, we measure recurrence in hertz or Hz.
Electromagnetic waves will be waves which can go through the vacuum of space. Mechanical
waves, not at all like electromagnetic waves, require the nearness of a material medium keeping
in mind the end goal to transport their vitality starting with one area then onto the next. Sound
waves are cases of mechanical waves while light waves are cases of electromagnetic waves.
Electromagnetic waves are made by the vibration of an electric charge. This vibration makes a
wave which has both an electric and an attractive segment. An electromagnetic wave transports
its vitality through a vacuum at a speed of 3.00 x 108 m/s (a speed esteem ordinarily spoke to by
the image c). The proliferation of an electromagnetic wave through a material medium happens
at a net speed which is under 3.00 x 108 m/s. This is portrayed in the liveliness underneath.
The instrument of vitality transport through a medium includes the assimilation and reemission
of the wave vitality by the molecules of the material. At the point when an electromagnetic wave
encroaches upon the molecules of a material, the vitality of that wave is retained. The retention
of vitality causes the electrons inside the iotas to experience vibrations. After a brief time of
vibrational movement, the vibrating electrons make another electromagnetic wave with an
indistinguishable recurrence from the main electromagnetic wave. While these vibrations happen
for just a brief timeframe, they defer the movement of the wave through the medium. Once the
vitality of the electromagnetic wave is reemitted by a molecule, it goes through a little locale of
space between particles. When it achieves the foll.
EM spectrum, or Electromagnetic spectrum is an organized representation of the EM waves, we are surrounded with, The order of the waves is arranged in accordance with the length of their wavelengths. For more information view the complete deck.
What are electromagnetic wavesSolutionWe are encompassed by w.pdfdeepaksatrker
What are electromagnetic waves?
Solution
We are encompassed by waves we can see and listen, from sea waves to sound waves. A wave
demonstrates the exchange of vitality, from the wind that begins a sea wave to the sound that
travels through the air to your ear drum. Waves that go through a physical protest or medium are
called mechanical waves. Dissimilar to mechanical waves, electromagnetic waves needn\'t
bother with a medium to travel or spread. Electric and attractive fields both deliver vibrations
and, together, the two sorts of vitality make electromagnetic waves.
Waves take distinctive shapes, yet electromagnetic waves all have a snake-like shape, which
makes them transverse waves. Transverse waves are measured by their tallness, or sufficiency,
and by their wavelength, or the separation between the most astounding purpose of one wave, the
peak, to the peak of the following wave. The most reduced purpose of a wave is known as a
trough. Trough to trough can be measured, as well. While dissecting an electromagnetic wave,
both the plentifulness and separation between waves is measured.
One entire wave, from peak to peak, or trough to trough, is known as a cycle. The quantity of
cycles that happen every second is the wave\'s recurrence. Out of appreciation for Heinrich
Hertz, we measure recurrence in hertz or Hz.
Electromagnetic waves will be waves which can go through the vacuum of space. Mechanical
waves, not at all like electromagnetic waves, require the nearness of a material medium keeping
in mind the end goal to transport their vitality starting with one area then onto the next. Sound
waves are cases of mechanical waves while light waves are cases of electromagnetic waves.
Electromagnetic waves are made by the vibration of an electric charge. This vibration makes a
wave which has both an electric and an attractive segment. An electromagnetic wave transports
its vitality through a vacuum at a speed of 3.00 x 108 m/s (a speed esteem ordinarily spoke to by
the image c). The proliferation of an electromagnetic wave through a material medium happens
at a net speed which is under 3.00 x 108 m/s. This is portrayed in the liveliness underneath.
The instrument of vitality transport through a medium includes the assimilation and reemission
of the wave vitality by the molecules of the material. At the point when an electromagnetic wave
encroaches upon the molecules of a material, the vitality of that wave is retained. The retention
of vitality causes the electrons inside the iotas to experience vibrations. After a brief time of
vibrational movement, the vibrating electrons make another electromagnetic wave with an
indistinguishable recurrence from the main electromagnetic wave. While these vibrations happen
for just a brief timeframe, they defer the movement of the wave through the medium. Once the
vitality of the electromagnetic wave is reemitted by a molecule, it goes through a little locale of
space between particles. When it achieves the foll.
EM spectrum, or Electromagnetic spectrum is an organized representation of the EM waves, we are surrounded with, The order of the waves is arranged in accordance with the length of their wavelengths. For more information view the complete deck.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
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.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
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.
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”.
2. Electromagnetic Waves
Section 1 slides 3- 31
What are electromagnetic waves?
Section 2 slides 32-59
The Electromagnetic Spectrum
Section 3 slides 60-69
Radio Communication
3. What are electromagnetic waves?
How electromagnetic waves are formed
How electric charges produce
electromagnetic waves
Properties of electromagnetic waves
5. Electromagnetic Waves…
Do not need matter to transfer energy.
Are made by vibrating electric charges and
can travel through space by transferring
energy between vibrating electric and
magnetic fields.
6. How do moving charges create
magnetic fields?
Any moving electric charge is surrounded by an
electric field and a magnetic field.
7. What happens when electric and
magnetic fields change?
A changing magnetic field creates a
changing electric field.
8. What happens when electric and
magnetic fields change?
A changing magnetic field creates a
changing electric field.
One example of this is a transformer which
transfers electric energy from one circuit to
another circuit.
9. What happens when electric and
magnetic fields change?
A changing magnetic field creates a changing
electric field.
One example of this is a transformer which
transfers electric energy from one circuit to
another circuit.
In the main coil changing electric current produces a
changing magnetic field
Which then creates a changing electric field in
another coil producing an electric current
The reverse is also true.
10. This page was copied from Nick Strobel's Astronomy Notes. Go to
his site at www.astronomynotes.com for the updated and
corrected version.
11. Making Electromagnetic Waves
When an electric charge vibrates, the electric
field around it changes creating a changing
magnetic field.
13. Making Electromagnetic Waves
An EM wave travels in all directions. The figure
only shows a wave traveling in one direction.
14. Making Electromagnetic Waves
The electric and magnetic fields vibrate at right
angles to the direction the wave travels so it is a
transverse wave.
15. Properties of EM Waves
All matter contains charged particles that
are always moving; therefore, all objects
emit EM waves.
16. Properties of EM Waves
All matter contains charged particles that
are always moving; therefore, all objects
emit EM waves.
The wavelengths become shorter as the
temperature of the material increases.
17. Properties of EM Waves
All matter contains charged particles that
are always moving; therefore, all objects
emit EM waves.
The wavelengths become shorter as the
temperature of the material increases.
EM waves carry radiant energy.
18. What is the speed of EM waves?
All EM waves travel
300,000 km/sec in
space. (speed of light-
nature’s limit!)
19. What is the speed of EM waves?
All EM waves travel
300,000 km/sec in
space. (speed of light-
nature’s limit!)
EM waves usually
travel slowest in
solids and fastest in
gases.
Material Speed
(km/s)
Vacuum 300,000
Air <300,000
Water 226,000
Glass 200,000
Diamond 124,000
20. What is the wavelength &
frequency of an EM wave?
Wavelength= distance from crest to crest.
21. What is the wavelength &
frequency of an EM wave?
Wavelength= distance from crest to crest.
Frequency= number of wavelengths that
pass a given point in 1 s.
22. What is the wavelength &
frequency of an EM wave?
Wavelength= distance from crest to crest.
Frequency= number of wavelengths that
pass a given point in 1 s.
As frequency increases, wavelength
becomes….
23. What is the wavelength &
frequency of an EM wave?
Wavelength= distance from crest to crest.
Frequency= number of wavelengths that
pass a given point in 1 s.
As frequency increases, wavelength
becomes smaller.
24. Can a wave be a particle?
In 1887, Heinrich Hertz discovered that
shining light on a metal caused electrons
to be ejected.
25. Can a wave be a particle?
In 1887, Heinrich Hertz discovered that
shining light on a metal caused electrons
to be ejected.
Whether or not electrons were ejected
depended upon frequency not the
amplitude of the light! Remember energy
depends on amplitude.
26. Can a wave be a particle?
Years later, Albert Einstein explained
Hertz’s discovery: EM waves can behave
as a particle called a photon whose
energy depends on the frequency of the
waves.
27. Can a particle be a wave?
Electrons fired at two
slits actually form an
interference pattern
similar to patterns
made by waves
28. Can a particle be a wave?
Electrons fired at two
slits actually form an
interference pattern
similar to patterns
made by waves
31. Electromagnetic Waves
How they are formed
Waves made by
vibrating electric
charges that can
travel through space
where there is no
matter
Kind of wave
Transverse with
alternating electric
and magnetic fields
Sometimes behave as
Waves or as
Particles (photons)
33. The whole range of EM wave…
Frequencies is called the
electromagnetic spectrum.
34. The whole range of EM wave…
Frequencies is called the
electromagnetic spectrum.
Different parts interact with matter in
different ways.
35. The whole range of EM wave…
Frequencies is called the
electromagnetic spectrum.
Different parts interact with matter in
different ways.
The ones humans can see are called
visible light, a small part of the whole
spectrum.
38. Devices detect other frequencies:
Antennae of a radio detects radio waves.
Radio waves are low frequency EM
waves with wavelengths longer than 1mm.
39. Devices detect other frequencies:
Antennae of a radio detects radio waves.
Radio waves are low frequency EM
waves with wavelengths longer than 1mm.
These waves must be turned into sound
waves by a radio before you can hear
them.
40. What are microwaves?
Microwaves are radio waves with
wavelengths less than 30 cm and higher
frequency & shorter wavelength.
41. What are microwaves?
Microwaves are radio waves with
wavelengths less than 30 cm and higher
frequency & shorter wavelength.
Cell phones and satellites use microwaves
between 1 cm & 20 cm for communication.
42. What are microwaves?
Microwaves are radio waves with wavelengths
less than 30 cm and higher frequency & shorter
wavelength.
Cell phones and satellites use microwaves
between 1 cm & 20 cm for communication.
In microwave ovens, a vibrating electric field
causes water molecules to rotate billions of
times per second causing friction, creating TE
which heats the food.
43. How does radar work?
Radio Detecting And Ranging or radar is
used to find position and speed of objects
by bouncing radio waves off the object.
44. What is magnetic resonance
imaging?
MRI was developed in the 1980s to use
radio waves to diagnose illnesses with a
strong magnet and a radio wave emitter
and a receiver. Protons in H atoms of the
body act like magnets lining up with the
field. This releases energy which the
receiver detects and creates a map of the
body’s tissues.
45. Infrared Waves
EM with wavelengths between 1mm & 750
billionths of a meter.
Used daily in remote controls, to read CD-
ROMs
Every objects gives off infrared waves;
hotter objects give off more than cooler
ones. Satellites can ID types of plants
growing in a region with infrared detectors
46. Visible Light
Range of EM humans can see from 750
billionths to 00 billionths of a meter.
You see different wavelengths as colors.
Blue has shortest
Red is the longest
Light looks white if all colors are present
47. A range of frequencies
In order of increasing frequency and
decreasing wavelength, the EM
spectrum consists of: very long
wave radio, used for
communication with submarines;
long, medium and short wave
radio (used for AM broadcasting);
FM radio, television and radar;
infra-red (heat) radiation, which is
recorded in the Earth photographs
taken by survey satellites; visible
light; ultraviolet light, which, while
invisible, stimulates fluorescence
in some materials; x rays &
gamma rays used in medicine and
released in radioactive decay
48. Ultraviolet Waves
EM waves with wavelengths from about
400 billionths to 10 billionths of a meter.
Have enough energy to enter skin cells
Longer wavelengths – UVA
Shorter wavelengths – UVB rays
Both can cause skin cancer
49. Can UV radiation be useful?
Helps body make vitamin D for healthy
bones and teeth
Used to sterilize medical supplies & equip
Detectives use fluorescent powder
(absorbs UV & glows) to find fingerprints
50.
51. What is the ozone layer?
20-50 km above earth
Molecule of 3 O atoms
Absorbs Sun’s harmful
UV rays
Ozone layer
decreasing due to
CFCs in AC,
refrigerators, &
cleaning fluids
52. What could happen to humans…
And other life on Earth if the ozone layer is
destroyed?
53. X Rays and Gamma Rays
EM waves with
shortest wavelength &
highest frequency
High Energy- go
through skin & muscle
High level exposure
causes cancer
54. X Rays and Gamma Rays
EM with wavelengths
shorter than 10
trillionths of a meter.
Highest energy, can
travel through several
centimeters of lead.
Both can be used in
radiation therapy to
kill diseased cells.
The composite image
shows the all sky
gamma ray
background.
55. Identify which statement is not true:
A. Gamma rays are low frequency waves.
B. X rays are high-energy waves.
C. Gamma rays are used to treat
diseases.
56. Why do you think MRIs cause ...
Less harm than X rays?
61. Radio Transmission
Radio stations
change sound to EM
waves & then your
radio receiver
changes the EM
waves back to sound
waves again.
62. How does a radio receive different
stations?
Each station broadcasts at a certain
frequency which you tune in by choosing
their frequency.
Carrier wave- the frequency of the EM
wave that a station uses
Microphones convert sound waves to a
changing electric current or electronic
signal containing the words & music.
63. How does a radio receive different
stations?
Microphones convert sound waves to a
changing electric current or electronic
signal containing the words & music.
The modified carrier wave vibrates
electrons in the station’s antennae
creating a radio wave that travels out in all
directions at the speed of light to your
radio antennae.
64. How does a radio receive different
stations?
The modified carrier wave vibrates electrons in
the station’s antennae creating a radio wave that
travels out in all directions at the speed of light to
your radio antennae.
The vibrating electrons produce a changing
electric current which your radio separates the
carrier wave from the signal to make the
speakers vibrate creating sound waves….
65. What is AM radio?
In AM amplitude changes but frequency does
not. AM frequencies range from 540,000 Hz
to 1,6000,000 Hz usually listed in kHz.
66. What is FM radio?
In FM radio stations transmit broadcast information by
changing the frequency of the carrier wave. The strength
of FM waves is always the same and is in megahertz.
Mega=million
67. Television
Uses radio waves to send electronic
signals in a carrier wave.
Sound is sent by FM; color and brightness
is sent at the same time by AM signals.
68. What is a cathode-ray tube?
Many TVs and computer monitors display
images on a CRT, a sealed vacuum tube
in which beams of electrons are produced.
Color TV produces 3 electron beams
inside the CRT which strike the inside of
the screen that is covered with more than
100,000 rectangular spots.
69. What is a cathode-ray tube?
There are 3 types of spots, red, green and
blue. The electron beams move back and
forth across the screen.
The signal from the TV station controls
how bright each spot is. Three spots
together can form any color.
You see a full color image on the TV.
70. Telephones
Sound waves microphone electric signal
radio waves transmitted to and from
microwave tower receiver electric signal
speaker sound wave
Mobile Phone BTS Base Transceiver Station BSC Base Station
Controller MSC Mobile services Switching Centre VLR Visitor
Location Register HLR Home Location Register
71. How do cordless phones work?
Cell phones and cordless telephones are
transceivers, device that transmits one
signal & receives another radio signal from
a base unit.
You can talk and listen at the same time
because the two signals are at different
frequencies.
72. How do pagers work?
A pager is a small radio receiver with a
phone number. A caller leaves a message
at a terminal with a call-back number.
At the terminal, the message is turned into
an electronic signal transmitted by radio
waves.
Newer pagers can send and receive
messages.
73. Communications Satellites
Thousands of satellites
orbit Earth. A radio or
TV station sends
microwave signals to
the satellite which
amplifies the signal and
sends it back to a
different place on
Earth. Satellite uses dif
freq to send & receive.
74. Global Positioning System
GPS is a system of 24 satellites, ground
monitoring stations and portable receivers
that determine your exact location on
Earth. GPS receiver measures the time it
takes for radio waves to travel from 4
different satellites to the receiver. The
system is owned and operated by the US
Dept of Defense, but the microwaves can
be used by anyone.