Let us explore the applications of
electromagnetic waves
Know the
applications
Of
electromagnetic
waves
Able to determine
the 4 electric
current
variations
Etc.
> Is the transmission of energy in the
form of a wave or particle through
space or through a material medium. It
has a tiny particles much too small to
see.
Here is an
example of a
radiation:
 Visible light, the ultraviolet
light that we see from the
sun and the transmission
signal for television
> these are all
common in our daily
lives these are also
non-ionizing radiation
which is harmless for
us. We’ll know the
examples of ionizing
radiation which are
the x-rays and gamma
rays
TODAY’S CONVERSATIONS :
> PHOTOS AND
EVEN MUSIC CAN
BE TRANSMITTED
THROUGH AIR
OVER
THOUSANDS OF
MILES BECAUSE
OF RADIO WAVE.
> WIRELESS
COMMUNICATI
ON HAS
BECOME
POSSIBLE
THROUGH
TRANSMISSION
.
> IF YOU MAY
RECALL RADIO
WAVES CAN BE
TRANSMITTED
THROUGH
EMPTY SPACE.
RADIO WAVE
~~~~~~~~~~~~~~~~~~~~~~~~~~
> It have the
longest wavelength
in the
electromagnetic
spectrum.
> They are also
produced by
making electrons
vibrate in an
antenna.
TODAY’S ROAD MAP
In a radio station sound is converted by
microphone into a pattern of electric current
variations which are :
Audio
frequency
(AF) signal
Radio frequency
(RF)
carriers
Amplitude
modulation
(AM)
Frequency
modulation
(FM)
AUDIO
AUDIOFREQUENCY:
FREQUENCY:
Let us talk about audio frequency!!!!
It has a lower frequency
and it has a sound waves
which our ears can hear
while.
RADIO
AUDIOFREQUENCY:
FREQUENCY:
Let us talk about radio frequency!!!!
> Are higher in
frequency and it acts
as a carrier wave in a
communication field.
AMPLITUDE
AUDIO
FREQUENCY:
MODULATION:
Let us talk about amplitude modulation !!!!
 This refers to the encoding of audio
signal on the carrier frequency.
 It is also used in standard
broadcasting because it can be sent
over long distances.
FREQUENCY
AUDIO
FREQUENCY:
MODULATION:
Let us talk about frequency modulation !!!!
 It is a very high frequency waves
provide a higher quality of
broadcasting instead of amplitude of
the RF carrier is the frequency of the
wave that changes too much the
signal is called FM.
> Microwaves may
also used in
communication.
Microwaves are used
in spacecraft
communication it
penetrates through
the ionosphere and
space.
> Communication
satellites are used to send
and receive radio signals
for telephone service ,
television, broadcasting,
scientific research and
weather forecast.
> Microwaves have short wavelengths
and are reflected by small objects this
property is used in radar.
• Radar in acronym is for RADIO
DETECTION AND RANGING.
• Radar system is considered of
antenna transmitter and a receiver.
 Microwaves are used
to transmit television
news coverage from
mobile broadcast
vehicles back to the
station
 A cellphone is a radio
transmitter and
receiver that uses
microwaves.
 In a microwave oven
food absorbs certain
microwave
frequencies very
strongly , the
microwaves penetrate
the food being heated
it will agitate the
water molecules
within the food, does
creating molecular
friction which
produces heat that
will cook it.
SUMMARY
Radiation – is the
transmission of energy in
the form of a wave or
particle through space or
through material medium
2 TYPES OF RADIATION:
= ionizing and non-ionizing
Radio wave – have the
longest wavelength
= Audio frequency - waves
that our ear can hear
= Radio frequency – carrier wave
in a communication field
= Amplitude modulation –
transmitting information through
radio wave
= Frequency modulation – the
process of encoding information
in a transmitted signal
Microwave – also used in
spacecraft communication
= Radar - ( RADIO DETECTION
AND RANGING )
THAT’S ALL ….
THANKS EVERYONE
FOR LISTENING!!!!!!!