electromagnetic wave
Electromagnetic
Wave
Maxwell's hypothesis
about the electromagnetic waves
The symptoms of electricity and magnetization closely
related to each other:
Ø
Law Bio-Savart or law Ampere: electric current
or charge that flows can produce a magnetic field around it.
Ø
Faraday's law : changes in the magnetic field
(magnetic flux) at a conducting loop may cause EMF induction so that the
resulting electric field.
v
Maxwell hypothesis: due to the change of the
magnetic field can induce an electric field, the electric field changes can
give rise to a magnetic field.
the properties of electromagnetic waves
electromagnetic waves gem is a surge caused by rambatan electric field
and magnetic field that mutually perpendicular each other, and both
perpendicular to the direction rambatannya.
Properties gem:
1.
Change the field of electric and magnetic field
happening at once.
2.
Travels
in a vacuum in medium ( not need perambatannya )
3.
Is of transverse waves so can dipolarisasikan
4.
May experience ricochet ( reflections )
refracting ( refraction ) scattering ( diffraction ) but reintegration (
interference ) as did waves in general.
5.
Quick rambatnya hanging from magnetic electrical
properties and medium through which it passes.
6.
In a
vacuum speed 3.108 ms-1
7.
Not
electrically charged
8.
Can
affect film plate
the spectrum of electromagnetic waves
Electromagnetic
waves consisting of a of differing frequency and long the wave, but sooner
precatorius in a vacuum is the same, namely 3.108 ms-1.
Order
spectrum gem sorted of frequency smallest to the largest or of the wavelength
largest to smallest is :
radio
and tv waves
microwave
/ radar
infrared
rays
visible light waves
ultaviolet
rays
x
rays
gamma
rays
 |
GEM Energy
Ø
quickly creep gem
 |
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 |
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c : quickly creep GEM in a vacuum (3.108
ms-1)
: Electric vacuum permittivity
(8,85 x 10-12 CN-1m-2)
: the magnetic permeability of vacuum
(4π
x 10-7 WbA-1m-1)
λ: wavelength (m)
f
: wave-frequency
(Hz)
Ø
The
strong relations of an electric field and strong magnetic field
The
strong relations of an electric field and strong magnetic field
Em : strong electric field
amplitude/maximum electric field (NC-1)
Bm : strong magnetic field
amplitude/maximum magnetic field (Wb.m-2 atau Tesla)
Ø
the
average energy meetings 
the
average energy meetings 
: the
average energy meetings (Jm-3)
Ø
The
intensity of electromagnetic waves
The
intensity of electromagnetic waves
: the
average radiation intensity/average radiation power (Wm-2)
Ø
Relationship of radiation intensity on average
with the average energy meetings
 |
: the
average radiation intensity/average radiation power (Wm-2) : the
average energy meetings (Jm-3)
c : quickly creep GEM in a vacuum (3.108
ms-1)
1. radio and
tv waves
Used
for the benefit of communication and information and news spread
2. microwave /
radar (1010 Hz)
Used for communications, cooking, radar (
radio detection and ranging ). Formula for radar:
S : distance
of objects from the radar (m)
c
: quickly creep GEM in a vacuum (3.108 ms-1)
t
: Pulse propagation time difference with the receipt of the echoes
reflected (s)
3. infrared
rays (1011 Hz – 1014 Hz)
Can
to make photographs the surface of earth it not detected by the naked eye.
4. visible light waves (430 nm – 690 nm)
To see an object; light waves iook
also be a source of life through photosynthesis process on plants.
5. ultaviolet
rays (1015 Hz – 1016 Hz)
Used
to know the elements which was conceived in an ingredient; ultraviolet rays
also dangerous for the people.
6. x rays (1016
Hz – 1020 Hz)
Industry
to commercial interests as in medical world for photographing position bone in
the body.
7. gamma rays
(1020 Hz – 1025 Hz)
Can
penetrate plate of lead or iron plates some centimetres sides.
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