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Created page with "==Key Stage 4== ===Meaning=== '''Ultra-violet''' are the third highest frequency and third shortest wavelength electromagnetic waves. ===Abou..."
==Key Stage 4==
===Meaning===
'''Ultra-violet''' are the third highest [[frequency]] and third shortest [[wavelength]] [[Electromagnetic Wave|electromagnetic waves]].
===About Ultra-violet===
: [[Ultra-violet]] is a [[Transverse Wave|transverse waves]].
: [[Ultra-violet]] can travel through a [[vacuum]] as well as through [[gas]]es in the [[Earth's Atmosphere|Earth's atmosphere]].
: The [[speed]] of [[ultra-violet]] through a [[vacuum]] is 300,000,000[[m/s]].
As a [[wave]] [[ultra-violet]]s can be:
*[[Transmit|Transmitted]] - [[ultra-violet]]s can pass through a [[medium]].
*[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by [[ultra-violet]] can be taken in by certain [[material]]s, particularly dark coloured [[material]]s.
*[[Reflection|Reflected]] - [[Ultra-violet]] can bounce off an [[interface]] between two [[medium|media]], particularly the surface of a shiny [[metal]].
*[[Refraction|Refracted]] - [[Ultra-violet]] can change direction when they cross the [[interface]] between two [[medium|media]].
====Unique Properties====
: [[Ultra-violet]] can cause [[electron]]s in some [[material]]s to gain enough [[energy]] to leave [[atom]]s creating [[ion]]s which can destroy [[Chemical Bond|chemical bonds]].
: [[Ultra-violet]] does not penetrate through the [[skin]].
: [[Ultra-violet]] is [[scatter]]ed by the [[Earth's Atmosphere|Earth's atmosphere]].
====Applications====
: [[Ultra-violet]] can cause [[electron]]s in the [[atom]]s of [[fluorescent]] [[molecule]]s to gain [[energy]]. When the [[electron]]s lose this [[energy]] they [[emit]] [[Visible Light|visible light]]. This can be used to reveal [[fluorescent]] ink to detect forged bank notes
: [[Ultra-violet]] causes damage to the skin by breaking [[Chemical Bond|chemical bonds]] so in an effort to protect itself the skin produces [[melanin]], a brown pigment. This causes the skin to become tanned. This is used in tanning beds.
: [[Ultra-violet]] can destroy [[micro-organism]]s in [[water]] by breaking [[Chemical Bond|chemical bonds]] in those [[micro-organism]]s, so can be used to sterilise water.
====Dangers====
: [[Ultra-violet]] can cause sunburn and skin cancer by ionising and damaging [[DNA]] [[molecule]]s in the skin [[Cell (Biology)|cells]] leading to a [[mutation]].
===Meaning===
'''Ultra-violet''' are the third highest [[frequency]] and third shortest [[wavelength]] [[Electromagnetic Wave|electromagnetic waves]].
===About Ultra-violet===
: [[Ultra-violet]] is a [[Transverse Wave|transverse waves]].
: [[Ultra-violet]] can travel through a [[vacuum]] as well as through [[gas]]es in the [[Earth's Atmosphere|Earth's atmosphere]].
: The [[speed]] of [[ultra-violet]] through a [[vacuum]] is 300,000,000[[m/s]].
As a [[wave]] [[ultra-violet]]s can be:
*[[Transmit|Transmitted]] - [[ultra-violet]]s can pass through a [[medium]].
*[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by [[ultra-violet]] can be taken in by certain [[material]]s, particularly dark coloured [[material]]s.
*[[Reflection|Reflected]] - [[Ultra-violet]] can bounce off an [[interface]] between two [[medium|media]], particularly the surface of a shiny [[metal]].
*[[Refraction|Refracted]] - [[Ultra-violet]] can change direction when they cross the [[interface]] between two [[medium|media]].
====Unique Properties====
: [[Ultra-violet]] can cause [[electron]]s in some [[material]]s to gain enough [[energy]] to leave [[atom]]s creating [[ion]]s which can destroy [[Chemical Bond|chemical bonds]].
: [[Ultra-violet]] does not penetrate through the [[skin]].
: [[Ultra-violet]] is [[scatter]]ed by the [[Earth's Atmosphere|Earth's atmosphere]].
====Applications====
: [[Ultra-violet]] can cause [[electron]]s in the [[atom]]s of [[fluorescent]] [[molecule]]s to gain [[energy]]. When the [[electron]]s lose this [[energy]] they [[emit]] [[Visible Light|visible light]]. This can be used to reveal [[fluorescent]] ink to detect forged bank notes
: [[Ultra-violet]] causes damage to the skin by breaking [[Chemical Bond|chemical bonds]] so in an effort to protect itself the skin produces [[melanin]], a brown pigment. This causes the skin to become tanned. This is used in tanning beds.
: [[Ultra-violet]] can destroy [[micro-organism]]s in [[water]] by breaking [[Chemical Bond|chemical bonds]] in those [[micro-organism]]s, so can be used to sterilise water.
====Dangers====
: [[Ultra-violet]] can cause sunburn and skin cancer by ionising and damaging [[DNA]] [[molecule]]s in the skin [[Cell (Biology)|cells]] leading to a [[mutation]].