Friends, I live in a university dormitory. There are three big things on the wall outside the dormitory. I want to ask what they are, and do they radiate?
Radiation? You can rest assured of that. We live in all kinds of radiation every day, infrared rays, ultraviolet rays and various communication signals. For example, the radiation of household appliances, mobile phones and computers is electromagnetic wave, which belongs to low-energy radiation and has no influence on human body. High-energy radiation includes ultraviolet rays, X rays, alpha rays or nuclear radiation. So don't worry.