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How are electro magnetic waves produced?
How are electro magnetic waves produced?
like radio waves, micro waves , x -rays
i mean i wanna know the instrument and it’s procedure
Thank you.
Every variable current and pulsating electric charge is the source of electro-magnetic radiation.
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If the current is uniformly increasing, i.e. if the charges are under uniform acceleration, then there will be no E.M. radiation. Only when the acceleration is non-uniform, there will be E.M. radiation.
..
In oscillatory motion, acceleration is continuously changing. Hence eclectic charge oscillations produce E.M. radiation.
.
Radio waves are produced by the oscillating current in a coil of wire.
[In the electrical wires of houses, there is alternating current. As such, there is E.M. radiation with the frequency of A.C].
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When a wire in a vacuum tube is heated to a high temperature, electrons come out of the wires. We can produce a beam of electrons. Velocity of electrons can be increased to a high value by a passing them in a high magnetic field. When these electrons are made to oscillate with high frequency micro waves are produced.
E.M. radiation occurs during random thermal motion of particles [thermal radiation]
.
If charges are abruptly decelerated, E.M. radiation occurs.
.
X-rays are produced when a beam of electrons are abruptly stopped by a target.
3 Responses to “How are electro magnetic waves produced?”
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November 20th, 2009
Posted by admin in x-ray instrument | 3 Comments »
It’s actually a fairly simple answer, although it’s complicated to see how it works.
At the fundamental level, the only way you can produce an electromagnetic field is from a moving charge.
Microwaves, X-rays, and radio waves are all light, although none of them are visible. The
special electromagnetic field responsible for this is called ai "photon", as you probably know. When an electron becomes excited, it moves to a higher energy level. When it returns to a lower state, the extra energy it had is emitted as either a photon or a phonon. A photon is light, and the moving charge in this case is obviously the electron moving between energy levels. A phonon is an imaginary particle we’ve created to refer to a lattice vibration of specific energy (basically, a phonon is heat).
To fully understand it, you’d need a background in quantum mechanics. But we’re still not sure about everything – if there was ever one thing that has messed with physicists for a long time, it’s the question "what is light"?
References :
Good Question, and Excellent Answer DWR.
From SJRTC.
Yes, in physics, we study the voltage and energy changes when an electron gains energy from radiant energy in space and consequently its orbit increases in diameter, and it reaches the next quantum level where it is unstable and subsequently releases its energy and returns into the former orbit. If you think of the vacuum of space as being filled with homogenous fluid (infinitely small sized), then radiant energy is like waves in this fluid, and electron is like a whirlpool in the atom in this fluid. So as more radiant energy waves in the vacuum of cosmic fluid strikes the electron whirlpool, more fluid enters the electron whirlpool, so it becomes heavier, and tends to move away from the proton, causing its orbit to increase in size. At one point, there is too much fluid in the whirlpool, and it is unstable, and it releases a quantum of fluid back into the vacuum of cosmic space, and regains its smaller size and smaller orbit. This release of fluid cases a ripple in the cosmic fluid in the vaccum of cosmic space and the ripple or wave travels at the speed of light in what is termed an electromagnetic wave. By definition, an electromagnetic wave is a whirlpool with no central density where total internal reflection of light or other energy wave can occur. In an electron whirlpool and proton whirlpool, total internal reflection of light or other energy waves occurs at the center of this whirlpool, so giving it its density and weight. Thus light and other electromagnetic waves do not have density, weight, and so are not attracted by gravity.
The effect is like a rubber ball tied to an elastic string and whirled around a person. As the weight of the ball increases, its orbit increases due to centrifugal force, and at one point the string would break.
References :
SJRTC
Every variable current and pulsating electric charge is the source of electro-magnetic radiation.
.
If the current is uniformly increasing, i.e. if the charges are under uniform acceleration, then there will be no E.M. radiation. Only when the acceleration is non-uniform, there will be E.M. radiation.
..
In oscillatory motion, acceleration is continuously changing. Hence eclectic charge oscillations produce E.M. radiation.
.
Radio waves are produced by the oscillating current in a coil of wire.
[In the electrical wires of houses, there is alternating current. As such, there is E.M. radiation with the frequency of A.C].
.
When a wire in a vacuum tube is heated to a high temperature, electrons come out of the wires. We can produce a beam of electrons. Velocity of electrons can be increased to a high value by a passing them in a high magnetic field. When these electrons are made to oscillate with high frequency micro waves are produced.
E.M. radiation occurs during random thermal motion of particles [thermal radiation]
.
If charges are abruptly decelerated, E.M. radiation occurs.
.
X-rays are produced when a beam of electrons are abruptly stopped by a target.
References :