The difference between ultraviolet and infrared light is that the wavelengths are different.
Ultraviolet light has a wavelength between 10nm and 400nm, which is shorter than visible light but longer than X-rays. Infrared is the wavelength between the microwave and visible electromagnetic waves, its wavelength between 760nm to 1mm, is longer than the wavelength of red light, non-visible light, corresponding to the frequency of about 430THz to 300GHz range. The thermal radiation emitted by an object at room temperature is mostly in this band.
Ultraviolet and infrared light have the following uses:
1. Infrared light can be used in military, industrial, scientific and medical applications.
2. Infrared night vision devices utilize instant near-infrared images to observe people or animals at night without being detected.
3. Infrared astronomy utilizes telescopes with sensors to penetrate stardust in space (e.g., molecular clouds), to detect stars such as planets, and to detect redshifted stars left over from the early universe.
4, infrared light penetrates clouds and fog than the ability of visible light, such as infrared guidance commonly used in missile navigation, thermal imagers and night vision goggles.
5, ultraviolet radiation can induce the skin to produce 1,000 international units of vitamin D in 15 minutes, overexposure to ultraviolet radiation may lead to sunburn.
6, the remote control of the TV is using infrared light, the money detector is using ultraviolet light.