Various Kinds of Electromagnetic Waves
SOURCE OF ELECTROMAGNETIC WAVES
Electric Oscillation.
Sunlight produces infrared light.
Mercury lamps produce ultra violet.
The shooting of electrons in a hollow tube on a metal chip produces X-rays (used for x-rays).
An unstable atomic nucleus produces gamma rays.
Nowadays almost everyone has this one equipment. He is so small that can be comfortably placed in a pocket, but is considered to have a very large function especially for communication. Yes, that thing is a cellphone (cell phone). Nowadays cell phones are not only used for calling but also for other functions such as sending and receiving short messages (sms), listening to music, or taking photos. How can mobile devices be connected to other mobile devices when they are far from each other?
Various Kinds of Electromagnetic Waves
1. Radio waves
Radio waves are a form of electromagnetic radiation, and are formed when electrically charged objects from oscillator waves (carrier waves) are modulated with audio waves (superimposed frequency) on the frequency contained in the frequency of radio waves (RF) in an electromagnetic spectrum, and the electromagnetic radiation moves by means of electric or magnetic oscillations.
2. Micro Waves (Micro Wave)
Micro wave (Micro Wave) is an electromagnetic wave with super high frequency (Super High Frequency) that is above 3 GHz (3 × 109 Hz)
If microwaves are absorbed by an object, a heating effect will appear on the object. If food absorbs microwave radiation, it gets hot and cooks in a short amount of time. This process is used in a microwave oven.
Microwaves are also used on radar. Radar is used to find and determine the trace of an object with microwaves with a frequency of around 1010 Hz.
3. Infrared (Infra Red)
Infrared is electromagnetic radiation of wavelengths longer than visible light, but shorter than radio wave radiation. The name (from Latin infra, "bottom"), red is the color of visible light with the longest waves. Infrared radiation has a range of three "orders" and has wavelengths between 700 nm and 1 mm. Infrared was discovered accidentally by Sir William Herschell, a British royal astronomer when he was conducting research looking for optical filter material that would be used to reduce the brightness of solar images in the solar system's telescope.
Electromagnetic Wave Formulas
Maxwell states that the speed of electromagnetic waves fulfills the equation:
Electromagnetic Wave Speed Equation
From the above formula it turns out that the velocity of electromagnetic wave propagation depends on the electrical permittivity and magnetic permeability of the medium. So, in general the equation for the velocity of electromagnetic wave propagation for various media is:
MAXWELL THEORY
The concept that can explain this phenomenon is the concept of electromagnetic waves. And, the concept of electromagnetic waves turned out to be very broad not only related to TV or cellphones, but also many other applications that we can often find everyday around us. Such applications include microwaves, radios, radars, or x-rays.
The two basic laws are those that link the symptoms of electricity and magnetism.
First, an electric current can produce (induce) a magnetic field. This is known as a symptom of magnetic induction. The basis for this concept is Oersted who discovered this phenomenon experimentally and was formulated in full by Ampere. The phenomenon of magnetic induction is known as Ampere's Law.