UV Light

• What are the two types of light discussed in the video?

  Visible and ultraviolet light
• How does visible light appear different colors?

  It depends on the wavelength
• What is the order of colors in the visible light spectrum?

  Red, orange, yellow, green, blue, indigo, violet
• Why can visible light be used for communication using optical fibers?

  Because the light is reflected every time it hits the surface and bounces back and forth throughout the fiber
• What is the advantage of using optical fibers over copper wires for data transmission?

  Optical fibers can transmit much more information and the signals are less likely to be distorted
• What is the wavelength range of ultraviolet radiation compared to visible light?

  Ultraviolet radiation has a shorter wavelength than visible light
• How does fluorescence work?

  Ultraviolet light is absorbed and the energy is re-emitted as visible light
• How do fluorescent lights work?

  Ultraviolet radiation is generated and absorbed by a phosphor coating, which then re-emits the energy as visible light
• What is one benefit of using fluorescent lights?

  They are energy efficient, saving on electricity bills and carbon dioxide emissions
• How can UV radiation be used for security purposes?

  Special security pens can write invisible codes that are only visible under UV light, making forgeries harder to detect
• How can UV radiation be used to sterilize water?

  UV radiation destroys microorganisms in the water, making it safe to drink