Wednesday, July 6, 2011

Ultraviolet Rays - Teo Yi LIn, Carisa Chan, Teoh Yun

Ultraviolet light is electromagnetic waves with a wave length shorter than visible light. UV Index is to inform public about the intensity of UV radiation . [1-3 means low exposure; 4-6 means medium; 7-9 means high; and above that is extreme exposures.] However, it differs with the skin color too! People with fairer skins are more affected by UV radiation while people with darker skins gets affected slower.


Positive uses for ultraviolet light:
- Produce Vitamin D
- Suntan
- Sterilizing medical equipment
- Bees use the reflection of ultraviolet lights off of flower petals to guide pollen collecting
- check for currency authenticity

Negative uses for ultraviolet light:
- Skin Cancer
- Sun burn

3 comments:

  1. Good Job:) i didn't know that bees used the reflection of ultraviolet lights off of flower petals to guide pollen collecting.

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  2. I like that fact where u say that the bees use ultraviolet light! Thanks for updating us!

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  3. Good description on introduction. However, how is it that people with fairer skin are more affected by UV radiation than darker people ? You could elaborate further.

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