To get through the hottest days of summer, here's how to read the UV index so you know when the sun is most dangerous.

Ultraviolet wavelengths, which range from 10 to 380 nanometers, are smaller and more energetic than those on the visible light spectrum. (Image credit: Ali Damouh/Science Photo Library via Getty ...

What is ultraviolet light, and where does it come from? Learn how UV radiation is classified, measured, and used in medicine, ...

Wavelength Selection. Keyboard controlled by up-down keys. Wavelength Range. 200-1100 nm CE 1021. Wavelength Accuracy. 325-1100 nm CE 1011. Wavelength Precision. Within 1 nm. Wavelength Display. 0 ...

The Texas summer is predicted to be “ hotter than normal ” in Fort Worth. With a week of seven 90 degree days in a row, residents are bound to need some sun protection. However, the temperature ...

More information: Nahoko Fujimoto et al, Wavelength dependence of ultraviolet light inactivation for SARS-CoV-2 omicron variants, Scientific Reports (2023). DOI: 10.1038/s41598-023-36610-6.

They see ultraviolet (UV) wavelengths, and that is key. UV rays can damage human eyes, so we filter them out. Throughout nature, we are an exception for UV vision, not the rule.

They have higher wavelengths but lower energy levels than other UV rays. They’re more penetrating than UVB rays, which means they can affect cells deeper in your skin.

Anyone who ever ended up with a sunburn knows violet wavelengths are real, as the Sun’s ultraviolet (UV) radiation is the reason you need to wear sunscreen, even though you can’t see those ...