Human eyes are not sensible to these radiations.
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Wavelengths below 350 nm are absorbed by Earth's atmosphere, primarily by ozone, oxygen, and nitrogen. Wavelengths above 750 nm are absorbed by the eye's photoreceptors, causing them to be outside the visible spectrum.
Wavelengths below 350 nm fall into the ultraviolet (UV) range which is not visible to the human eye. This is because the photoreceptor cells in our eyes are not sensitive to wavelengths below 400 nm. The cornea and lens of the eye also filter out most UV radiation before it reaches the retina.
Very roughly . . . 350 to 700 nanometers428,000 to 857,000 Gigahertz
350 micrograms is typically written as 350 mcg.
The range of wavelengths for ultraviolet light is typically between 10 to 400 nanometers. This range is further divided into UVA (315–400 nm), UVB (280–315 nm), and UVC (100–280 nm) based on their wavelengths and potential effects on living organisms.
The White Cliffs of Dover reach heights of up to 350 feet (110 meters) above sea level. They are an iconic landmark on the English coastline, known for their distinctive chalky white appearance.