1. Light is the same as the electromagnetic wave used in wireless communication. The only difference is the wavelength of the two.
2. As mentioned in my complaint, the sun It emits 360-degree high-power visible light and other invisible electromagnetic waves all the time. If I say that I put a person on the sun, or put him very close to him, he will definitely die. But humans on earth have nothing to do on a sunny day. So we draw the first conclusion that no matter how powerful the emission source is, the intensity of electromagnetic waves will attenuate with distance. Therefore, the farther the mobile phone is from the base station, the worse the signal is.
3. The impact of electromagnetic waves on human health:
1. Everyone receives visible light radiation every day, so the impact on human health...well, there should be no impact. Here is the answer to question 2 of the subject: LED emits electromagnetic waves in the visible light band (which should be accompanied by a small amount of ultraviolet and infrared rays). The possible impact on the human body is the same as that of sunlight, which is many times weaker than sunlight and can be ignored.
2. There are two types of electromagnetic waves close to visible light: ultraviolet rays close to blue light wavelengths, and infrared rays close to red light wavelengths. Infrared rays have a thermal effect. Ultraviolet rays can sterilize and disinfect. When the human body is exposed to radiation, the skin will darken. Long-term exposure will burn the skin. Excessive exposure can easily cause skin cancer.
3. The wireless communication electromagnetic waves that many people worry about "affecting human health" are all high-frequency and short-wavelength electromagnetic waves. But the wavelength is not as long as infrared. In winter, people use hundreds of watts of infrared heaters to keep themselves warm at home and don’t think it is dangerous. Why do you think this mobile phone router with a power of less than 1 watt is harmful to your health? For example, microwave ovens use 915MHz or 2450MHz. slow! These two frequencies look familiar! The former is close to the frequency of GSM 900, and the latter is really the frequency of home wifi 2.4GHz. (The above data comes from Interactive Encyclopedia and Wikipedia) Are you panicking? Microwave ovens use the same frequency as wifi and mobile phones! Theoretically, electromagnetic waves from mobile phones and WiFi can have a heating effect on the human body.
However, there are the following differences between microwave ovens and mobile phone routers:
1. Mobile phones and routers emit electromagnetic waves in an open manner, and only a small part of their emitted power is absorbed by the human body. If If it is all absorbed by the human body, then there will be no communication. Microwave ovens emit electromagnetic waves concentratedly in a closed space, and the emitted power is completely absorbed by the food.
2. The power of microwave ovens is generally within 1000w. It takes me several minutes to defrost a pound of meat. The average transmission power of mobile phones during calls is 0.1-0.25w for GSM and 0.1-1w for CDMA. China’s standards for wireless routers are relatively strict, with a maximum of 10mW. That is to say, it is only 1/10 of a mobile phone and one hundred thousandth of a microwave oven. Even if all this power is used to heat the human body, it should not be enough to take away the heat if you fan yourself a few times - so we can draw a conclusion: turning on the air conditioner/electric fan and using wifi/mobile phone can reduce the impact of radiation on the human body The harm caused!