Ultraviolet Radiation

Ultraviolet (UV) radiation is a type of electromagnetic radiation that has a shorter wavelength than visible light and longer wavelength than X-rays. It is not visible to the human eye, but it is present in sunlight and can also be produced artificially.

Types of UV Radiation

• UVA (320-400 nm): Long-wave UV radiation, least harmful, penetrates deep into the skin
• UVB (280-320 nm): Medium-wave UV radiation, causes sunburn and skin damage
• UVC (100-280 nm): Short-wave UV radiation, mostly absorbed by the ozone layer and atmosphere

Effects of UV Radiation

Exposure to UV radiation can have both positive and negative effects on living organisms.

• Positive effects: UV radiation is essential for the production of vitamin D in humans
• Negative effects: Overexposure to UV radiation can cause skin damage, sunburn, premature aging, and increase the risk of skin cancer

Protection from UV Radiation

To protect yourself from the harmful effects of UV radiation, it is important to:

• Apply sunscreen with a high SPF (Sun Protection Factor)
• Wear protective clothing, such as hats, sunglasses, and long sleeves
• Avoid excessive sun exposure, especially during peak UV hours (10am-4pm)
• Seek shade when outdoors

Study Guide

Here are some key points to remember when studying ultraviolet radiation:

1. Define ultraviolet radiation and its position in the electromagnetic spectrum.
2. Identify the three types of UV radiation and their respective wavelengths.
3. Discuss the positive and negative effects of UV radiation on living organisms.
4. Explain the measures to protect oneself from the harmful effects of UV radiation.