Vast universe, infinite starry sky, electromagnetic wave space than the atmosphere of space, is infinitely large proportion of light years, countless extraterrestrial stars have all sorts of electromagnetic wave amplitude source, and its density is not air can be compared. Cosmic space, the sun produces light radiation are insignificant, can imagine the power of electromagnetic waves. In the atmosphere, lightning, the world's broadcasting stations, communications (letter), navigation equipment, and intentionally or unintentionally created in the interference wave intertwined together, bustling full of space, people live in the sea of electromagnetic waves.
Electromagnetic waves are ubiquitous, and sources of electromagnetic radiation can be divided into natural and man-made sources of electromagnetic radiation. Lightning, sunspot activity, cosmic rays and other electromagnetic radiation, which is a natural source of electromagnetic radiation; and man-made sources of electromagnetic radiation are mainly various types of radio equipment, including industrial, scientific and medical equipment. We use the alternating current frequency of 50 hertz, one because the frequency is low, can not spread in the air; two because the power is large, the cost of transmission and reception is too high, so in the wire transmission. But AC power in the generation of transmission use process, every moment in the production of a large number of electromagnetic waves.
To long-wave, for example, 30 kHz in one second to have 30,000 cycles, each wavelength will have 10,000 meters, a steady stream of diffusion to the surrounding area, is a band of electromagnetic waves is enough to scare people. Not to mention the universe is too much electromagnetic waves, with light years can not count the large team.
The launch and reception of useful electromagnetic waves, modulation and demodulation, is the result of a variety of frequency conversion. In particular, a variety of radio transmitters, signal sources, etc., the greater the power, the stronger the amplitude. That is, the ordinary radio, television, cell phones and other internal work of the various frequency circuits are interlaced, radiating electromagnetic waves, only their power is not big, the electromagnetic wave generated by the transmission will not be very far.
Humans live in the sea of electromagnetic waves, because of electromagnetic waves, human life is colorful.
The harm of electromagnetic waves on the body, compared to such as polite pollution, water pollution, food pollution, dust, etc., is insignificant. Long-term work in a high magnetic field, strong radiation environment, there is no occupational disease of electric radiation. Long-term living in the vicinity of various radio and television transmitters, various wireless communication transmitters, base stations, and other groups of people in the vicinity of the decades have not seen abnormalities.
Electromagnetic waves have a great impact on people, the scientific sector has never stopped exploring and researching on it. National electromagnetic safety standards: long, medium and short-wave electromagnetic radiation less than 10 volts / m, ultra-short-wave electromagnetic radiation less than 5 volts / m, microwave electromagnetic radiation less than 10 microwatts / cm2, is the result of previous and modern scientific research. State-approved production of mobile telephones, wireless walkie-talkies, indoor wireless telephones, radio and television broadcast transmitters, wireless base stations, microwave and satellite communication devices, radar, radio remote control and other types of radio equipment, as well as, for example, microwave ovens, high-frequency eye lamps, medical magnetic **** vibration equipment, helium arc welding machines, radio frequency heaters, high-frequency thermal laminators, AC high-voltage power transmission lines, transfer switches, electric motors, Generators, televisions, computers, etc. are electromagnetic radiation, the harm to people is far below the national standards, can be used safely, will not cause harm to people. If you play the computer to watch TV and other close injury to the eyes, mainly not electromagnetic wave injury, fatigue injury component accounted for more.
Objective conditions of the natural generation of electromagnetic waves, is constantly generated by the process of continuous attenuation, man-made electromagnetic waves, in recent years, although a significant increase, but in the electromagnetic wave family, this increase is insignificant. The scientific community said that the electromagnetic wave pollution is serious, mainly does not refer to the damage to people refers to the abuse of man-made electromagnetic wave, touch the intrusion, the occurrence of accidents increased to strengthen the management and so on.
In all the electromagnetic wave damage to the human body, the cell phone is the most serious, mainly because the phone in the call, is close to the ear and head, is the most sensitive parts of the human body. If you're not even afraid to use your cell phone, you should have no worries about anything else.
May you believe in science, respect science, do not fear electromagnetic radiation, fully enjoy life.