Table of Contents
What is present in ultraviolet rays?
Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nm (with a corresponding frequency around 30 PHz) to 400 nm (750 THz), shorter than that of visible light, but longer than X-rays.
How is UV light created?
UV radiation is produced either by heating a body to an incandescent temperature, as is the case with solar UV, or by passing an electric current through a gas, usually vaporized mercury. The latter process is the mechanism whereby UV radiation is produced artificially.
What UV is sunlight?
The sunlight that reaches the earth has ultraviolet A and ultraviolet B (UVA and UVB) rays. These ultraviolet rays are the main causes of damage to the skin from the sun. UVA and UVB rays affect the skin’s sensitivity to sun exposure in different ways.
Is there UV in sunlight?
The most common form of UV radiation is sunlight, which produces three main types of UV rays: UVA. UVB. UVC.
Why is UV light blue?
You know it as ultraviolet light, the wavelengths between 290nm and 380nm are (UVB/A) and 380nm to 500nm are (blue light). Because blue light has a very short wavelength, it produces a higher amount of energy than the other wavelengths of the visible spectrum.
What are some other sources of UV rays?
Some other sources of UV rays are black lights, mercury lamps, and tanning lights. Since all the electromagnetic waves travel at different speeds through the vacuum, their wavelength and frequency vary.
Why do we need to be exposed to UV rays?
The UV rays present in the sun is the key factor for both, in skin cancer and in getting vitamin-D. We have to expose our skin to sunlight in order to get vitamin-D, but for a certain limited time only. The total time of exposure to sunlight is varied by, time of year, location of sunlight, surrounding factors.
Where does the energy from UV radiation come from?
What is UV radiation? Ultraviolet (UV) radiation is a form of electromagnetic radiation that comes from the sun and man-made sources like tanning beds and welding torches. Radiation is the emission (sending out) of energy from any source.
How are the three types of UV radiation classified?
UV radiation is classified into three primary types: ultraviolet A (UVA), ultraviolet B (UVB), and ultraviolet C (UVC). These groups are based on the measure of their wavelength, which is measured in nanometers (nm= 0.000000001 meters or 1×10-9 meters).