The electromagnetic wave energy emitted by our mobile phones and computers is very low, which is very small compared with visible light. Why should we prevent it?

You said that electromagnetic waves emitted by mobile phones and computers can't cause migration, that's right. These electromagnetic waves really can't cause electron migration in atoms or molecules, that is, this kind of radiation can't change the structure of atoms or molecules, let alone the structure of atomic nuclei.

However, the response of matter to electromagnetic waves not only leads to migration, but also has a more important and widely used reason-causing oscillating current in matter.

When an electromagnetic wave passes through a conductor, free electrons/ions in the conductor will move according to the electric field of the electromagnetic wave. That is, the atomic/molecular structure cannot be changed, but free electrons/ions can be driven to do directional motion.

The red light irradiation of platinum will not emit electrons, but will make the current in platinum generate heat.

Microwave oven, you know? Microwave can hardly cause electron migration, but it can cause heat. The heating point of microwave oven is generally a water-rich object, which is a poor conductor, while completely insulated ceramics will not absorb the heat generated by microwave. And the good conductor (metal) in the microwave oven will destroy the microwave oven itself.

For another example, we use an antenna to receive radio signals/mobile phone signals, relying on the fact that when electromagnetic waves pass through the antenna, they will cause free electrons in the antenna to move and form a current, and then amplify the current to obtain signals.

Okay, look at the human body. If the electromagnetic wave is irradiated, the atoms in the human body will not move further, but there are many ions in the human body, which will generate current and even local heat. It has been learned in biology that all kinds of reactions in human body depend on electron transfer and ion concentration effect. Oxidative respiratory chain, electron transfer chain, ion concentration controlling muscle tension, nerve impulse caused by ion concentration change, etc. Almost all physiological processes involve the movement or concentration change of electrons or ions. Electromagnetic waves obviously have a strong interference ability to these physiological processes.

Experiments show that people are prone to dizziness, nausea and secretion disorder in strong electromagnetic field environment. Because nerve impulses is an ion concentration pulse, similar to an electric pulse, it is particularly susceptible to electromagnetic waves.

There was an argument in America. Because the residential area was built under a large high-voltage transmission line near the power station, the incidence of childhood leukemia in this residential area was significantly higher than that in other areas in more than ten years. It was later proved that it was caused by electromagnetic waves radiated by high-voltage transmission lines. After that, high-voltage lines are usually erected very high or buried deep underground.

Of course, the radiation power of mobile phones or computers is far less than that of obvious diseases, but they may still cause dizziness, nausea, fatigue and other nerve stimulation symptoms. Because nerves are particularly sensitive to electrical signals. What will be the result of long-term contact is hard to say now. Speaking of prevention, it is necessary to plan ahead. But there is no connection at all, which is impossible.