Entity: ULTRAVIOLET-RAY
Ultraviolet-ray, commonly known as UV, is electromagnetic radiation with wavelengths between 10-400 nanometers, shorter than visible light but longer than X-rays. It constitutes about 10% of the Sun's total electromagnetic radiation output and has effects on the human body, primarily on the skin.
ULTRAVIOLET-RAY
Etymology
The term 'ultraviolet-ray' originates from the Latin words 'ultra,' meaning beyond, and 'violet,' referring to the color of visible light with the shortest wavelength.
Definition
Ultraviolet-ray, commonly known as UV, is electromagnetic radiation with wavelengths between 10-400 nanometers, shorter than visible light but longer than X-rays. It constitutes about 10% of the Sun's total electromagnetic radiation output and has effects on the human body, primarily on the skin.
Historical Context
The discovery of ultraviolet radiation dates back to the early 19th century when Johann Wilhelm Ritter first observed its effects. Since then, UV radiation has been extensively studied for its various applications and implications.
Cultural Significance
UV radiation plays a crucial role in various cultural practices, such as tanning and sunbathing. However, overexposure to UV rays can lead to harmful effects on the skin, emphasizing the importance of sun protection.
Related Concepts
- Visible Light: The portion of the electromagnetic spectrum that is visible to the human eye.
- X-rays: Electromagnetic radiation with shorter wavelengths and higher energy than UV rays.
See Also
A form of electromagnetic radiation with wavelengths shorter than visible light and longer than X-rays, having effects primarily on the skin.