Harm of ultraviolet washing clothes to human body

The essence of light is actually electromagnetic waves, including infrared rays, visible rays and ultraviolet rays, but the frequency is much higher than the radio waves used in mobile communication. Infrared light and visible light are harmless to human body, while moderate ultraviolet light can kill and sterilize human body, but it will be harmful to human body, such as cancer. Sunlight contains ultraviolet rays. There are also X-rays, Y-rays and cosmic rays higher than the frequency of light. Among them, X-rays commonly used in hospital chest X-ray equipment are definitely harmful to human body if they are irradiated for a long time. There have also been cases of cancer caused by long-term exposure to X-rays in history.