The answer is; UV (ultraviolet)
The security pens use UV light to illuminate some marking on an object,such as a watermark, to identify its authenticity or owner. The markings are usually invisible to the naked eye under visible light. The marks are only visible when illuminated with UV light. This is because the marking is made of a fluorescent material that absorbs light of a shorter wavelength (this case UV) and emits a longer wavelength (this case visible light).
The ultraviolet rays are a type of electromagnetic wave that is used in security pens.
Further Explanation:
The electromagnetic waves are propagated by instantaneous periodic variation of the magnetic field and electric field intensity. They include visible light, infrared, gamma rays, radio waves, and ultraviolet rays. When the spectrum of light is passing through the prism, then they differentiate into a different color of the rainbow.
Ultraviolet lights are invisible to naked human eyes. The primary source of ultraviolet light is a sun that is differentiated into three different forms UV-A, UV-C, and UV-B. UV-B and UV-C are most harmful and can cause cellular damage to the living organism.UV lights are used in security pens to highlight the marking on the object for security purposes or to identify the owner easily. They can easily absorb light of short wavelength and have a higher frequency. Their wavelength is shorter than the visible lights.
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Answer Details:
Grade: High School
Subject: Biology
Topic: Radiations
Keywords:
Ultraviolet rays, spectrum, visible light, infrared, differentiate, UV-A, UV-B, UV-C, light, higher frequency, human eyes, pen, security, sun.
