State two applications of ultraviolet radiation.

Answer

**Step-by-Step Solution:**

1. **Understanding Ultraviolet Radiation**: Ultraviolet (UV) radiation is a type of electromagnetic (EM) radiation that comes from the sun. It falls between visible light and X-rays in the electromagnetic spectrum.

2. **Types of Ultraviolet Radiation**: UV radiation is categorized into three types: UVA, UVB, and UVC. Each type has different properties and applications.

3. **First Application - Synthesis of Vitamin D**: One significant application of UV radiation is its role in the synthesis of vitamin D in the human body. When UV rays from the sun strike the skin, they facilitate the conversion of cholesterol into vitamin D, which is essential for various bodily functions, including maintaining healthy bones.

4. **Second Application - Sterilization of Medical Equipment**: Another important application of UV radiation is its ability to inactivate bacteria. This property is utilized in the sterilization of medical equipment. UV light is employed to eliminate bacteria and other pathogens on surgical instruments, ensuring they are safe for use in medical procedures.

5. **Conclusion**: In summary, two applications of ultraviolet radiation are:
- The synthesis of vitamin D in the skin.
- The sterilization of medical equipment to inactivate bacteria.

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