- Electromagnetic emission (EM) waves behave as
- All EM waves spread in the vacuum with the same speed, that is of "light speed", c = 3.0 '108 m / s
- it wave equality,
- c = f l
1. FM Radio and Television (TV)
frequency FM radio is on all the TV frequency. For broadcast TV antenna that is required is very high because of the antenna between the transmitter and the antenna beam is required of the recipient directly. If the transmitter antenna is not high enough then the network will not be able to pass a high building or mountain pass.
2.Gelombang Micro (microwave)
The EM wave is called the micro-wave long a shorter than radio waves. Short wave has a very broad application for the transmission of communication such as long distance telephone and radar systems. Speed of objects such as cars can measured with the Doppler shift of the Microwave can bounce. Microwave has been widely used for cooking. Water molecules in food beresonansi on the frequency in the micro wave. Food will be easily absorbed micro-wave energy so effectively can be used for cooking.
3.Gelombang Radio AM (amplitude Modulation)
At the lowest frequency is used for radio transmission. Because its easily to be raised, the initial frequency is developed.
4. Short Radio Waves
Name in accordance with the EM wave has a shorter than other commercial radio. Short wave used for communication purposes, for example by the police or the public. Transmission of short wave but can be easily obstructed by the atmosphere can bounce to avoid obstacles in the land.
5. Infrared radiation (infrared)
Infrared has a mean frequency under red light. Waves can be generated from the process of heating and EM waves are the most important in the process of transfer of heat. Human skin can absorb almost all the infrared rays and is felt as warmth. An important part of the sun's radiation is a form of electromagnetic.
6. The rays (visible light)
Rays appear to have a narrow spectrum in which EM waves can be arrested by the normal human eye. Red rays have the lowest frequency or a wavelength between the longest visible rays, while the purple rays have the highest frequency and wavelength cut.
7. Ultraviolet radiation (UV)
Ultraviolet radiation can burn the skin and cause skin cancer. This radiation can cause chemical reactions on the skin so that it produces vitamin D. Most of the UV radiation absorbed by the atmosphere called the ozone.
8. X-ray
Rays can be produced on a very hot gas, such as on the surface of the sun. X-rays can occur in katode tube (CRT) when the electrons crash screen. Due to the nature of the X-ray damage, the television, osiloskop, the computer screen and so protected in such a way so that it does not harm users. X-rays with much higher energy use for material characterization and medical diagnosis.
9. Gamma ray
This ray is the only EM waves that can only be generated by the atomic nucleus. Rays can have a higher frequency and wavelength is shorter than the string-X. Like the X-ray, these rays are also dangerous to health. ray is also used for medical diagnose.
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