In a popular YouTube video, several people put their mobile phones in a circle, and then connected the calls, and soon placed in the middle of the phone began to expand, and then turned into "popcorn." The video is funny but also conveys another scary message, mobile phone radiation has reached the level of microwave oven. However, the video turned out to be a hoax, but it has made people more or less worried about mobile phone radiation.

First, let's talk about radiation. Radiation can be roughly divided into two categories, nuclear radiation and electromagnetic radiation. Nuclear radiation is the radiation produced by radioactive elements, which carries very high energy protons, neutrons, helium nuclei, electrons, photons, and so on. The energy carried by nuclear radiation is higher than the chemical bond energy inside the molecules in the biological body, so it can break the chemical bond in the human body, resulting in the change of molecular properties. In most cases, the cells exposed to radiation will be destroyed and die, but it can also cause genetic changes in human cells, resulting in cancer cells.

Electromagnetic radiation and nuclear radiation are obviously different. Electromagnetic radiation is the radiation of electromagnetic waves, oscillating electric and magnetic fields in space in the form of waves to form electromagnetic waves, visible light is a kind of electromagnetic waves, as well as our daily mentioned X-ray, ultraviolet, infrared light, microwave and radio waves, these are electromagnetic waves. In electromagnetic waves, some very short-wavelength gamma rays, X-rays, ultraviolet rays and even short-wavelength visible light carry energy higher than the molecular chemical bond energy, and these high-energy radiation can also damage proteins and DNA molecules like nuclear radiation. And most of the visible light, infrared radiation, including mobile phone radiation, energy is smaller than the intermolecular chemical bond energy, so these low-energy radiation is impossible to destroy the molecular structure, but if the intensity is high, it can also cause human burns.

WiFi wireless router operating frequency is generally 2.4GHz (there are also 5GHz), 3G network frequency between 1.7-2.4GHz, and mobile phone signal frequency between 0.8-0.96GHz and 1.71-1.85GHz, in these frequency ranges, radiation damage to the human body as a thermal effect. And the penetration of these bands is weak, if you do not feel the skin heat, there is no need to worry about being harmed by mobile phone radiation.

So from a physical point of view, the radiation of the mobile phone is only low-energy radiation, there is no energy that can destroy the molecular bond energy, so there is no need to worry that the mobile phone will cause cancer or cause much damage to your body, at most warm your face. You might get more radiation in one minute than you would in a lifetime from your cell phone.