Ultra violet can not be seen with human eyesight. So it would be "invisible." However the rays could cause sunburn.
no
UV (ultra violet) rays! :)
Plants on earth are affected by UV rays. They are fatal rays of the sun.
Ultra-violet, short-wave radio waves, x-rays, gamma rays, cosmic rays
Ultraviolet (UV) alpha rays have lower energy and longer wavelengths than UV beta rays. UV alpha rays are less harmful to the skin and are often used in medical and cosmetic treatments, while UV beta rays have higher energy and can cause more damage to the skin, such as sunburns and skin aging.
ultra violet rays
ultra violet rays Actually, it's spelled ultraviolet rays.
Ultra Violet Rays
Ultra violet radiation or UV rays are harmful. Ozone protects us from it.
ultra violet rays
"ozone"
no
UV rays? or Ultra Violet rays
Eleanor Hilda Russell has written: 'Ultra-violet radiation and actinotherapy' -- subject(s): Ultra-violet rays, Spectrum, Ultra-violet, Phototherapy
chlorophyll
No
Ultra Violet :D