Ultraviolet Rays

Definition, history, type of UV, Apllication and its effect to human

1. ULTRAVIOLET RAYS Group 5 (11- 4 ) Fajar Priyono Fatimannisaa Azzahro Fianka Nadya Amira Y . Created By :

2. What is Ultraviolet rays ? Ultraviolet rays is invisible rays , that are part of energy coming from the sun but some animal can see the ultraviolet rays such as bird and insect. Ultraviolet rays has wavelength in range : 40 0 nm to 1 0  nm (4 x 10 -7 m to 10 -8 m) Ultraviolet wave rays has frequency in range : 10 15 - 10 16 Hz

3. Johann Wilhelm Ritter (1776 - 1810 ) In 1801 the Germany physicist Johann Wilhelm Ritter made the observation using silver chloride by exposed the colours of visible which he created by passing the sunlight through the glass prism, that the silver chloride darkened. He found an intense (more quickly) reaction with the silver chloride at beyond the end of violet (visible light ) and it’s called as   “ ultraviolet light ”. “Ultraviolet” means “beyond violet” ( from Latin : Ultra = “ beyond ” ) The Inventor

4. UV A UV B UV C Wavelength Range 400 nm–315 nm 315 nm–280 nm 280 nm-100 nm Alternative Names Long wave, black light Medium wave Short wave, germicidal KIND OF UV

5. UV A Wavelength Range : 400 nm–315 nm Alternative Names : Long wave, black light, not absorbed by the ozone layer Benefits Effect :Helps in the production of Vitamin D in the human’s body. Provitamin D will be produced in hypodermis in the bottom of dermical layer in skin. Harmful Effect : May darkened skin color because UV A stimulates the melanosit of the skin to produce more brown pigments (melanin) Application : 1. Checking of counterfeit banknotes. 2 . Hardening of inks and coating. 3 . Pest control. Insects are attracted to the UV light and killed by the electric shock in bug zappers. epidermis dermis hypodermis

6. Wavelength Range : 315 nm–280 nm Alternative Names : Medium wave, mostly absorbed by the ozone layer but not until the earth’s surface Benefits Effect : Helps in the treatment of psoriasis (disease causing red and scaly skins). Harmful Effect : May cause sunburn on the skin Application : Medical applications such as treatment of psoriasis (a kind of disease causing red and scaly skins). UV B

7. Wavelength Range : 280 nm-100 nm Alternative Names : Short wave, germicidal, completely absorbed by the ozone layer and atmosphere Benefits Effect : Desinfection of drinking water and sterilization of apparatus by damaging the DNA of bacteria (germs). Harmful Effect : May cause skin cancer and skin damage Application : Disinfection of drinking water and sterilization of apparatus. Energy UV radiation destroys the DNA of bacteria and micro-organism. UV C

8. UV A : From the sun to the earth UV B : From the sun to the ozone layer UV C : From the sun to the mesosfer The discrete spectrum of wavelengths based on the difficulties of atom to excitate .

9. Kill the microorganism. Such as : Laminar Air Flow with Ultraviolet Spectrophotometer UV Money detector Application

10. This specto ph otometer is used to meassure the ultraviolet rays absorption by the colourless solution sample. This spectrophotometer is ’ nt used to meassure colour solution absorption. Spectrophotometer UV

11. Spectrophotometer UV

12. Spectrophotometer UV

13. Methods for avoid negatif influence 1. Seek out a shady spot

14. Methods for avoid negatif influence 2 . Wear a long sleeved shirt, long pants, gloves, hats or umbrellas.

15. Methods for avoid negatif influence 3 . Use a moisturizer ( lotion ) sunscreen

16. Methods for avoid negatif influence 4. Give extra protection to babies and children . Save me…!!!

17. Methods for avoid negatif influence 5. Wear Sunglasses .

18. Conclusion Ultraviolet ray is a wave that came from the sun and belongs to the electromagnetic wave. With the high Frequency the Energy of the UV light also high , so it can give energy for chemical reaction. UV light is useful in many sector such as medical, analysis , and other. Overuses of UV may cause severe damage to the skin or eyes.

19. Thanks For Your Attention

20. Application 1. Money Detector The feast is usually more widespread circulation of counterfeit currency. Well, in anticipation that you could use counterfeit money detector practical. This counterfeit money detector using UV light that is able to distinguish real money with fake money. Under exposure to ultraviolet light, the original serial number will change the color of money. In addition, the real money is also printed using a special ink that will appear invisible when illuminated its nominal value. Thus, counterfeit currency detector is able to work accurately. How to use counterfeit money detector is also very easy. Simply press the button to turn on the UV light, then shine on the money. You can already see the difference even counterfeit money that may be missed by the naked eye.