Definition of Electromagnetic waves.
Electromagnetic waves are waves that can propagate even in the absence medium. Energy electromagnetic waves propagate in a few characters that can be measured, that is: wavelength / wavelength, frequency, amplitude / amplitude, velocity. Wave amplitude is high, while the wavelength is the distance between two peaks. Frequency is the number of waves passing through a given point in one unit of time. The frequency depends on the speed of the wave merambatnya. Because electromagnetic energy is a constant speed (the speed of light), wavelength and frequency is inversely proportional. The longer the wave, the lower the frequency, and the shorter the higher the frequency of a wave.
Electromagnetic waves have a very large frequency range. Grouped by frequency of electromagnetic waves are called spectrum of electromagnetic waves. Visible light is one example of an electromagnetic wave spectrum. Light frequencies ranging from 4.0 X 1014 Hz for a red light up to 7.9 X 1014 Hz for light violet (purple)
The characteristics of electromagnetic waves
From the description above we can conclude several characteristics of electromagnetic waves are the following:
1. changes in electrical field and magnetic field occurs at the same time, so that both fields have a maximum and minimum prices at the same time and at the same place.
2. direction of electrical field and magnetic field perpendicular to each other and both perpendicular to the direction of wave propagation.
3. No. 2 is obtained from the characteristic that electromagnetic waves are transverse waves.
4. like waves in general, an incident electromagnetic wave reflection, refraction, interference, and diffraction. As well as including an incident polarization of transverse waves.
5. rapid propagation of electromagnetic waves depends only on the properties of electric and magnetic medium ditmpuhnya. Rapid propagation of electromagnetic waves in vacuum is a common constant.
From the description above we can conclude several characteristics of electromagnetic waves are the following:
1. changes in electrical field and magnetic field occurs at the same time, so that both fields have a maximum and minimum prices at the same time and at the same place.
2. direction of electrical field and magnetic field perpendicular to each other and both perpendicular to the direction of wave propagation.
3. No. 2 is obtained from the characteristic that electromagnetic waves are transverse waves.
4. like waves in general, an incident electromagnetic wave reflection, refraction, interference, and diffraction. As well as including an incident polarization of transverse waves.
5. rapid propagation of electromagnetic waves depends only on the properties of electric and magnetic medium ditmpuhnya. Rapid propagation of electromagnetic waves in vacuum is a common constant.
Radio waves
Radio waves are classified according to wavelength or frequency. If the wavelength is high, then the frequency must be low or vice versa. Frequency radio waves ranging from 30 kHz up and grouped according to the width of the frequency. Radio waves generated by electric charges are accelerated through the conductor wires. These charges are raised by the electronic circuit called an oscillator. These radio waves are emitted from the antenna and received by the antenna as well. You can not hear the radio directly, but the radio receiver will convert wave energy first into sound energy.Grouping of radio waves.The frequency widthSpecific WavelengthSome UsesLow (LF)30 kHz - 300 kHz1500 m long waveAnd long wave radio communications over long distancesMedium (MF)300 kHz - 3 MHzMedium wave 300 mMediu wave of local and long distance radioHigh (HF)3MHz - 30 MHzShort wave 30mShort-wave radio and amateur radio communications, and CBVeri high (VHF)30 MHz - 300 MHzVery short wave 3mFM radio, police and emergency servicesUltrahigh (UHF)300 MHz - 3 GHzUltra short wave 30 cmTV (line 4.5)Super high (SHF)Above 3 GHz3cm MicrowavesRadar, satellite communications, telephone, and TV channelsMicrowavesMicrowaves (mikrowaves) is a radio wave with the highest frequency is above 3 GHz. If the microwaves are absorbed by an object, it would appear the effect of heating on the thing. If the food absorb microwave radiation, then the food gets hot in a very short time intervals. Process is utilized in a microwave oven to cook food quickly and economically.Microwaves
are also used in aircraft RADAR (Radio Detection and Ranging) and RADAR
means seeking to determine traces of an object by using microwaves. The aircraft radar utilizing microwave reflectivity properties. Due
to rapid propagation of electromagnetic glombang c = 3 X 108 m / s,
then the observed time interval between transmission of the reception,
for example, you can find the object distance is captured by the radar s.
Infrared rays
Infrared light covers areas up to 1014 Hz 1011Hz frequency or wavelength region 10-4 cm to 10-1 cm. if you check the spectrum produced by an incandescent lamp with a detector which is connected to the miliampermeter, then ampermeter needle just above the red end of the spectrum. Rays are not visible but can be detected in the red spectrum is called infrared radiation.
Infamerah rays generated by electrons in the molecules are vibrating because diipanaskan objects. So any hot objects emit infrared light would. The amount of infrared light emitted depends on the temperature and color of objects.
Health conditions can be diagnosed by examining the infrared emission from the body. Special infrared photo called thermogram is used to detect blood circulation problems, arthritis and cancer. Infrared radiation can also be used in burglar alarm. A thief without sepengetahuaanya would block light and hide the alarm.
visible light
Visible light as electromagnetic radiation of the most familiar to us can be defined as part of the spectrum of electromagnetic waves that can be detected by the human eye. Wavelength depending on the color looks nervariasi wavelengths ranging from approximately 4 x 10-7 m to light violet (purple) to 7x 10-7 m for the red light. Usefulness of the light one of them is someone the use of lasers in fiber optics in telecommunications and medicine.
Infrared light covers areas up to 1014 Hz 1011Hz frequency or wavelength region 10-4 cm to 10-1 cm. if you check the spectrum produced by an incandescent lamp with a detector which is connected to the miliampermeter, then ampermeter needle just above the red end of the spectrum. Rays are not visible but can be detected in the red spectrum is called infrared radiation.
Infamerah rays generated by electrons in the molecules are vibrating because diipanaskan objects. So any hot objects emit infrared light would. The amount of infrared light emitted depends on the temperature and color of objects.
Health conditions can be diagnosed by examining the infrared emission from the body. Special infrared photo called thermogram is used to detect blood circulation problems, arthritis and cancer. Infrared radiation can also be used in burglar alarm. A thief without sepengetahuaanya would block light and hide the alarm.
visible light
Visible light as electromagnetic radiation of the most familiar to us can be defined as part of the spectrum of electromagnetic waves that can be detected by the human eye. Wavelength depending on the color looks nervariasi wavelengths ranging from approximately 4 x 10-7 m to light violet (purple) to 7x 10-7 m for the red light. Usefulness of the light one of them is someone the use of lasers in fiber optics in telecommunications and medicine.
Ultraviolet rays
Ultraviolet light has a frequency of 1015 Hz in the region up to 1016 Hz or in the long wave of 10-8 m 10-7 m. This wave is generated by atoms and molecules in an electric flame. Uv rays required in the assimilation of plants and can kill the germs of skin disease.
The sun is the major source of ultraviolet rays memancaarkan surface of the earth, the ozone layer in the upper layer atmosferlah which serves to absorb ultraviolet rays and ultraviolet rays pass that does not endanger the life of a living creature on earth.
Ultraviolet light has a frequency of 1015 Hz in the region up to 1016 Hz or in the long wave of 10-8 m 10-7 m. This wave is generated by atoms and molecules in an electric flame. Uv rays required in the assimilation of plants and can kill the germs of skin disease.
The sun is the major source of ultraviolet rays memancaarkan surface of the earth, the ozone layer in the upper layer atmosferlah which serves to absorb ultraviolet rays and ultraviolet rays pass that does not endanger the life of a living creature on earth.
X-ray
X-rays have frequencies between 10 Hz to 10 Hz. very short wavelength of 10 cm to 10 cm. although such an X-ray but has strong penetrating power, it can penetrate thick books, a few centimeters thick wood and a thick aluminum plate cm.sinar X is commonly used in medicine to photograph the position of the bones in the body, especially to determine the fracture. However, the use of X-rays have to be careful because the network of human cells can be damaged due to the use of X-rays that are too long.
X-rays have frequencies between 10 Hz to 10 Hz. very short wavelength of 10 cm to 10 cm. although such an X-ray but has strong penetrating power, it can penetrate thick books, a few centimeters thick wood and a thick aluminum plate cm.sinar X is commonly used in medicine to photograph the position of the bones in the body, especially to determine the fracture. However, the use of X-rays have to be careful because the network of human cells can be damaged due to the use of X-rays that are too long.
Gamma rays
Gamma rays have a frequency between 10 Hz to 10 Hz or wavelengths between 10 cm to 10 cm. The greatest penetrating power, which causes serious effects if absorbed by body tissues.
Gamma rays have a frequency between 10 Hz to 10 Hz or wavelengths between 10 cm to 10 cm. The greatest penetrating power, which causes serious effects if absorbed by body tissues.
APPLICATION
In our daily life with a working system is a lot of electromagnetic waves produced various tools that rs our lives better. Suppose you know what it's Microwave Oven? ................
Microwave oven is one of the Bantu in cooking. Microwaves or microwaves generated by a magnetron, a tube similar to the way kerjnya TV. a high voltage generating large currents are then converted into microwaves. Microwaves are directed along a hollow wave guide for the whole space into compartments. Microwaves in a compartment with easy entry into the food. Menguncang microwaves energy of water molecules in food so that these molecules become hot. thus the heat energy transferred from the water molecules into the surrounding water molecules, causing the food cooked from the inside rather than outside as in a conventional oven. Another example is why we can turn on the TV from a distance just by pressing the buttons on the remote control? ...... it communicates with the TV remote control via the infrared radiation generated by the LED (Light Emiting Diode) contained in the unit
In our daily life with a working system is a lot of electromagnetic waves produced various tools that rs our lives better. Suppose you know what it's Microwave Oven? ................
Microwave oven is one of the Bantu in cooking. Microwaves or microwaves generated by a magnetron, a tube similar to the way kerjnya TV. a high voltage generating large currents are then converted into microwaves. Microwaves are directed along a hollow wave guide for the whole space into compartments. Microwaves in a compartment with easy entry into the food. Menguncang microwaves energy of water molecules in food so that these molecules become hot. thus the heat energy transferred from the water molecules into the surrounding water molecules, causing the food cooked from the inside rather than outside as in a conventional oven. Another example is why we can turn on the TV from a distance just by pressing the buttons on the remote control? ...... it communicates with the TV remote control via the infrared radiation generated by the LED (Light Emiting Diode) contained in the unit
