Презентация Ultraviolet radiation (UV) онлайн
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Презентации » Физика » Ultraviolet radiation (UV)
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- Тип файла:ppt / pptx (powerpoint)
- Всего слайдов:36 слайдов
- Для класса:1,2,3,4,5,6,7,8,9,10,11
- Размер файла:680.83 kB
- Просмотров:84
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- Автор:неизвестен
Слайды и текст к этой презентации:
№4 слайд
![Meet, ultraviolet! The](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img3.jpg)
Содержание слайда: Meet, ultraviolet!
The radiation of the Sun contains a few types of emitting, which differ from one another in the wavelength. The intermediate radiation, or ultraviolet radiation, is believed to have both benign and pernicious impact on the health of living things. It is able to pass through the atmosphere even in cold and cloudy weather.
№5 слайд
![Let s consider the most](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img4.jpg)
Содержание слайда: Let's consider the most common types of UV:
Let's consider the most common types of UV:
UVA (400-315nm) rays have a relatively long wave length and represent close to 95% of the UV rays that make it to the Earth’s surface .
UVB (315-280nm) have a medium wave length. Only its part passes through the atmosphere.
№6 слайд
![UVA UVA rays age skin cells](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img5.jpg)
Содержание слайда: UVA
UVA rays age skin cells and can damage their DNA. These rays are linked to long-term skin damage such as wrinkles, but they are also thought to play a role in some skin cancers. Most tanning beds give off large amounts of UVA, which has been found to increase skin cancer risk.
№14 слайд
![Vitamin D Vitamin D](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img13.jpg)
Содержание слайда: Vitamin D
Vitamin D
Reasonable exposure to ultraviolet radiation from the sun can be a good source of vitamin D. Getting enough vitamin D can help stave off autoimmune diseases, cardiovascular disease, many types of cancer, dementia, types 1 and 2 diabetes mellitus, and respiratory tract infections.
№15 слайд
![Serotonin Serotonin Vitamin D](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img14.jpg)
Содержание слайда: Serotonin
Serotonin
Vitamin D promotes the creation of serotonin. The production of serotonin is in direct proportion to the degree of bright sunlight the body receives. Serotonin is a monoamine neurotransmitter that is thought to provide sensations of happiness, well being and serenity to human beings.
№16 слайд
![Melanin Melanin The amount of](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img15.jpg)
Содержание слайда: Melanin
Melanin
The amount of the brown pigment melanin in the skin increases after exposure to UV radiation at moderate levels depending on skin type. Melanin is an excellent photoprotectant that absorbs both UVB and UVA radiation and dissipates the energy as harmless heat, protecting the skin against DNA damage.
№20 слайд
![Eye damage Prolonged optical](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img19.jpg)
Содержание слайда: Eye damage
Prolonged optical exposure to sunlight, especially intense ultraviolet light, may be linked to cortical cataracts. Short-term over-exposure can cause snow blindness, which is analogous to sunburn of the cornea, or can cause solar retinopathy, which is long-lasting retinal damage and vision impairment from sungazing.
№21 слайд
![UV skin protection SPF stands](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img20.jpg)
Содержание слайда: UV skin protection
SPF stands for sun protection factor. Sunscreens are classified by an SPF number which refers to their ability to deflect UVB rays. The SPF rating is calculated by comparing the amount of time needed to burn sunscreen-protected skin vs. unprotected skin.
№22 слайд
![Classic vs. Mineral Which is](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img21.jpg)
Содержание слайда: Classic vs. Mineral: Which is Which?
Classic and Mineral Sunscreens are differentiated by their active sun protection ingredients. Classic sunscreens use chemical active ingredients designed to absorb and dissipate UVA/UVB rays, while Mineral sunscreens use mineral active ingredients such as Titanium Dioxide and Zinc Oxide to scatter and reflect UVA/UVB rays.
№23 слайд
![The effect of classic suntans](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img22.jpg)
Содержание слайда: The effect of classic suntans is based on chemical reactions by swallowing sun radiation and mineral ones create a protective layer on the skin surface.
The effect of classic suntans is based on chemical reactions by swallowing sun radiation and mineral ones create a protective layer on the skin surface.
№32 слайд
![Sterilization amp](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img31.jpg)
Содержание слайда: Sterilization & disinfection
Ultraviolet lamps are used to sterilize workspaces and tools used in biology laboratories and medical facilities.
Solar water disinfection has been researched for cheaply treating contaminated water using natural sunlight. The UV-A radiation and increased water temperature kill organisms in the water.
№33 слайд
![Insects trapping Ultraviolet](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img32.jpg)
Содержание слайда: Insects trapping
Ultraviolet traps called bug zappers are used to eliminate various small flying insects. They are attracted to the UV and are killed using an electric shock, or trapped once they come into contact with the device. Different designs of ultraviolet radiation traps are also used by entomologists for collecting nocturnal insects during faunistic survey studies.
№36 слайд
![Sources http](/documents_6/5d9289aae5d24d23fffc4755c7c1aac5/img35.jpg)
Содержание слайда: Sources
http://www.coolasuncare.com/sun-science/
https://www.google.ru/amp/www.sofeminine.co.uk/skin-care/uv-rays-how-do-they-work-s565165.html.amp
https://www.loc.gov/rr/scitech/mysteries/colors.html
https://en.wikipedia.org/wiki/Ultraviolet?wprov=sfsi1
https://www.cancer.org/cancer/skin-cancer/prevention-and-early-detection/what-is-uv-radiation.html
https://www.quora.com/How-does-UV-radiation-affect-photosynthesis-in-plants
http://www.sciencedirect.com/science/article/pii/S0098847209001580
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