3. Properties of
Electromagnetic
Waves
Electromagnetic waves is waves that can vine
Electromagnetic waves can vine in vacuum mediation.
even there’s no medium or area/without any
medium
A transverse wave
Didn’t have any electric charge so move straight in magnetic field
and electric field
Can undergo reflection, refraction, fusion, deflection, polarization
The change of electric and magnetic field happen in the same
time, so the electric and magnetic field will be on the same phase
and proportional
4.
5. Because the length of the waves ranged
between 1 – 1000 meters and the
frequency ranged between 104 until 107
hertz.
6. Radio waves is a waves that have frequency
ranged between 104 until 107 hertz and the
So….
length of the waves ranged between 1 – 1000
meters. This waves function is as “courier” in
information technology. “Courier” means a
waves properties that can be reflected with
earth ionosfer , so it can reach some places with
a long distance on earth and can be captured by
the radio, television, handphone and etc.
7. Radio waves created from electric charge that
accelerated through the conductor wires. This
charges generated by the electronic circuit called an
oscillator.
10. Radio waves that can be
captured can be a sound, which
is:
AM (Amplitude Modulation)
Amplitude modulation waves
as an information carrier have
a big frequency , ranged
between 550 kHz until 1.600 kHz
11. Radio waves that can be
captured can be a sound, which
is:
FM (Frequency Modulation)
Use frequency wave modulation as an information carrier. The
frequency ranged is about 88 kHz until 108 kHz.
But, from those waves, the waves that AM showed is tend to be
noisy that FM, because the existance of electrical events in the air
that can disturb the amplitude. In far-reaching FM is worse because
can’t be reflected through the ionosphere layer.
12. FREQUENCY LENGTH Specific Wavelength Applications
Low (LF) Long Wave Long wave radio and long
30 kHz – 300 kHz 1500 m distance communication
Medium (MF) Medium Wave Local medium wave and
300 kHz – 3 mHz 300 m long distance radio
High (HF) Short Wave Short wave radio and
3 mHz – 30 mHz 30 m communication, amateur
radio and CB
Very High (VHF) Very Short Wave FM Radio, police, and
30 mHz – 300 mHz 3m emergency service
Ultrahigh (UHF) Ultra Short Wave TV (line 4, 5)
300 mHz – 3 GHz 30 cm
Super High (SHF) Microwave Radar, satellite
> 3 GHz 3 cm communication,
telephone, and TV channel
13. NOTE!
1. VHF and UHF
This kind of wave can’t be reflected by
Emission of FM wave layer in broadcasting
atmosphere used because
with VHFis narrow. excellence is free from
its scope wave. It’s
2.electric interferention, so the music sounds
AM and FM
Emission of AM wave used in broadcasting with
melodious.
long wave and can be reflected by the
ionosphere layer
14. 3. Medium Wave
Radio wave with 1 MHz (1.000.000
Hz) is easy to reflected by the
ionosphere layer
15. 4. Micro Wave
Radio wave with highest frequency is up to 3
GHz. If food adsorb the radiation of the micro
wave, the food will be hot in short time.
Microwave also used in RADAR. RADAR means
search and determined trace something with
microwave
16. s = distance of objects that
captured radar
λ
c = 3 x 108 m/s
λ
20. Radio
Radio wave has the longest
wave length in electromagnetic
spectrum. This wave can be
longer than soccer field or as
short as a ball. Radio wave do
than just bring music to our
radio. They carry signal for
television and handphone too.
21.
22. Hand phone
An cellular phones also use radio
waves to transmit information. This
wave is much smaller that the TV
and FM radio waves.
