Ultraviolet (UV) rays

Ultraviolet (UV) rays are electromagnetic radiation from the sun, with wavelengths shorter than visible light but longer than X-rays.

Types of UV rays:

1. UVA (320-400 nm): Penetrates deep into skin, causing aging and wrinkles.
2. UVB (290-320 nm): Primarily responsible for sunburn and skin cancer.
3. UVC (100-290 nm): Absorbed by Earth’s atmosphere, not reaching the surface.

Energy Conservation

Effects of UV rays:

1. Skin damage and cancer
2. Premature aging
3. Eye damage (cataracts, macular degeneration)
4. Immune system suppression
5. DNA damage

Protection from UV rays:

1. Wear protective clothing and hats
2. Apply broad-spectrum sunscreen (SPF 30+)
3. Seek shade, especially during peak hours (10am-4pm)
4. Wear UV-blocking sunglasses
5. Avoid tanning beds

UV rays also have beneficial effects:

1. Vitamin D production in skin
2. Disinfection and sterilization
3. Medical treatments (phototherapy)

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