Ultraviolet
Ultraviolet, jiske UV ke naam se bhi jaana jaae hae, light ke uu rang hae jiske insaan nai dekhe sake hae, lekin jiske kuch janwar, jaise ki kirrwa, crocodile, aur chhota chirriya hae.
UV ke wavelength, 10 se 400 namometres rahe hae, jon dekhae waala roshni (visible light) se chhotaa aur X-ray se lambaa hae. UV radiation suraj ke roshni me rahe hae aur ii suraj ke kul rishni me se 10% hae. UV, electricity arcs, mercury-vapour batti, tanning batti aur kariya roshni se bhi bane hae.
Insaan ke UV se suntan aur sunburm hoe hae aur skin cancer ke khatraa bhi barrhe hae. Suraj bahut jaada UV banae hae aur agar duniya ke atmosphere isme se jaada UV ke absirb nai kartaa tab insaan ke jiina muskil rahtaa.[1] Jon UV ke wavelength 121 nm se kamtii hae, atmosphere me ionise hoe jaae hae.[2] UV me ek chij achchhaa hae ki isse insaan aur jaanwar mr vitamin D bane hae, jisse achchhaa haddi bane hae.[3]
- ↑ "Reference Solar Spectral Irradiance: Air Mass 1.5". Archived from the original on 27 January 2011. Retrieved 2009-11-12.
- ↑ Haigh, Joanna D. (2007). "The Sun and the Earth's Climate: Absorption of solar spectral radiation by the atmosphere". Living Reviews in Solar Physics 4 (2): 2. doi:10.12942/lrsp-2007-2.
- ↑ Wacker, Matthias; Holick, Michael F. (2013-01-01). "Sunlight and Vitamin D". Dermato-endocrinology 5 (1): 51–108. doi:10.4161/derm.24494. ISSN 1938-1972. PMC 3897598. PMID 24494042.