Usually, we call the effect of electromagnetic waves on objects radiation, which is divided into electromagnetic radiation (light, microwave, WIFI signal, etc. ) and ionizing radiation (x-rays, gamma rays, etc. ). The energy of the former is very low, and only long-term high-dose acceptance (such as sunbathing) may cause harm to people. Even the latter, as long as attention is paid to protection, will not cause harm to the human body.
Electromagnetic waves can be divided into FM signals, cell phone signals, WIFI signals, visible light, X-rays and gamma rays according to different frequencies. The figure below is a general term for electromagnetic waves with different frequencies. The frequency of WIFI is 2400 MHz, and the figure below belongs to decimeter wave. Millimeter wave, centimeter wave and decimeter wave are collectively called microwave.
Frequency, wavelength, energy of electromagnetic wave and its application (picture from network)
So, how does the WIFI signal interact with the human body? WIFI signal is a kind of microwave, and the main effect of microwave on human body is thermal effect. The thermal effect is mainly that the polar molecules in the organism rotate repeatedly and rapidly under the action of microwave high-frequency electric field, and heat is generated through friction, which is mainly water in the human body. The power of WIFI signal is very small, and biological tissues absorb less microwave energy. It can radiate absorbed microwave energy (heat) to the whole body or outside the body through blood circulation and its own thermal regulation system.
So, is WIFI radiation harmful to human body? We already know that the influence of WIFI signal on human body is mainly thermal effect, and the generated heat can be recovered through the regulation system of human body, so it has little influence on human body. At the same time it can be compared with other electromagnetic waves. Because the energy of electromagnetic wave is directly proportional to its frequency, the frequency of visible light is about 200,000 times that of electromagnetic wave. That is to say, at the same intensity, the energy of visible light is about 200,000 times that of WIFI signal, and the radiation of WIFI to human body is far less than that of light. Comparing the radiation of WIFI signal with that of microwave oven, the frequency of WIFI signal is basically the same as that of microwave oven, but the radiation intensity of microwave oven is about 6.5438+ten thousand times that of WIFI signal, and the radiation in microwave oven is much larger than that of WIFI signal.
It can be seen that the WIFI signal has little impact on the human body and is completely within the safe range. As long as it is not close to the WIFI signal generator for a long time, the influence of WIFI radiation on human body can be completely ignored.
At the same time, it is pointed out that according to the national standard of electromagnetic radiation, the radiation level of WIFI is 1% of the national standard, and the Ministry of Environmental Protection has not taken it as the regulatory object, that is, exempted from management. This shows that the management department also believes that WIFI signals are safe for people.