Electromagnetic radiation is a combination of electric and magnetic fields which oscillate and propagate through space and carrying energy from one place to another. Visible light is one form of electromagnetic radiation. Theoretical research on electromagnetic radiation called elektrodinamik, sub-field of electromagnetism.
Basic theory of electromagnetic wave propagation was first described in 1873 by James Clerk Maxwell in his papers at the Royal Society about the dynamics of electromagnetic field theory (the English language: A dynamical theory of the electromagnetic field), based on the results of his research work between 1861 and 1865.
In 1878 David E. Hughes was the first to send and receive radio waves when he found that the induced balance disturbance caused to the phone makes. He demonstrated his discovery to the Royal Society in 1880 but only say it was just an induction.
Was Heinrich Rudolf Hertz who, between 1886 and 1888, was first proved Maxwell's theory through experiment, demonstrating that radio radiation had all the properties of wave (now called Hertzian waves), and found that the electromagnetic equations can be formulated into a partial differential equation called the wave equation.
Electromagnetic waves discovered by Heinrich Hertz.
Each has an acceleration of electric charge emits electromagnetic radiation. When the wire (or panghantar like antennas) delivers alternating current, electromagnetic radiation dirambatkan at the same frequency with an electric current. Depending on circumstances, such as electromagnetic waves can be either a wave or as particles. As a wave, characterized by the velocity (speed of light), wavelength, and frequency. When considered as particles, they are known as photons, and each has the energy associated with the wave frequency is shown by the Planck relation E = HI ½, where E is the photon energy, h is Planck's constant â € "6626 Ã-10 â'34 Ja • s â € "and Î ½ is the frequency of the waves.
Einstein then update formula becomes Ephoton = h1 ½.
Definition of Electromagnetic Waves
Electromagnetic waves are:
a. Transverse wave.
b. Waves that can propagate with speed 3108 m / s.
c. Waves that can propagate in a vacuum without any medium.
d. The electric field that turned into a magnetic field.
Definition of Electromagnetic Waves
Electromagnetic waves are the factors of the wavelength, frequency and propagation of electromagnetic waves or the relationship between the propagation of waves that can propagate in vacuum with wavelength and frequency multiplication.
Electromagnetic Wave Equation
The equation is
f I. c =
= C: f
III. f = c:
Description:
C = speed (3108 m / s)
F = frequency (Hz)
= Wavelength (m)
Scientists figure
Is an instrumental figure in developing wherewith Electromagnetic fields, among others:
a. Hans Christian Oersted
b. James Clark Maxwell
c. Michael Faraday
d. Charles Augustin Coulomb
e. Rudolph Heirich hertz
Electromagnetic Wave Propagation Speed
Depends on two quantities, namely:
) a. Electric permittivity (
b. Magnetic permeability (Mo)
Electromagnetic Waves Sprektrum
Namely:
a. For the frequency from high to low
1. Gamma Rays: 1020 Hz - 1024 Hz
2. X-ray: 1016 Hz - 1020 Hz
3. Ultraviolet: 1015 Hz - 1018 Hz
4. Visible light: 4.1014 Hz - Hz 7,5.1014
5. Infra red: 1011 Hz - 1014 Hz
6. Microwave: 108 Hz - 1012 Hz
7. Radio Waves: 104 Hz - 108 Hz
a. For wavelengths from high to low
1. Radio Waves: 3m - 1,500 m
2. Microwave: 3.10-14
3. Infra red: (7.10-7) m - 10-6m
4. Ultraviolet: 10-8 - 10-7m
5. X-rays: (10-9 - 10-6) cm
6. Gamma rays: 3.10-12
Properties - properties of Electromagnetic Waves
Generally, all types of waves have properties, among others:
a. Is a transverse wave.
b. Propagating straight
c. Propagation direction can not be deflected in an electric field magnetic checkers
d. Can be reflected (releksi)
e. Can be bent (diffracted)
f. Refraction
g. Can Berinteferensi
h. Can dipolarisasikan
Maxwell theory
Based on, among others:
a. Coulomb and Gauss' Law
b. Bio-Savart Law
c. Faraday's Law
Conclusion of the People of Scientists
Some people who give conclusions, among others:
a. Hans Christian Oersted concluded that the electric current (moving charge) menghasilakn magnetic field.
b. James Clark Maxwell concludes that the changing electric field produces a magnetic field.
c. Michael Faraday concluded that the changing magnetic field produces a changing electric field - change as well.
Law - Law of Electromagnetic Waves
Law - the law that, among other things:
1. Electrical charge can cause the surrounding magnetic field (Bio-Savart Law).
2. An electric current that flows generate a magnetic field (Coulomb law).
3. Changes in the magnetic field can produce electric fields (Faraday's Law)
Microwave
Microwave properties, among others:
a. Heat effect when interacting with matter.
b. Easy dipantulakan by items measuring several meters because the wavelength is only a few sentimater.
Microwaves used for several things, namely:
a. Cooking food in a microwave oven.
b. Calculating the distance, guiding aircraft landings during bad weather, radar guided missiles pda. Reinforced radar called LIDAR (laser-like, but coming from the microwave).
c. Send a report on closed circuit television network.
