Ultraviolet

• 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 visible light?

  Red, orange, yellow, green, blue, indigo, violet
• What does the phrase "boy G bit" help to remember?

  The order of colors in visible light
• How do optical fibers transmit light?

  By reflecting light at the surface
• Why are materials used in optical fibers important?

  They must totally reflect light
• What is the advantage of using optical fibers over copper wires?

  They transmit more information with less distortion
• What comes after violet in the light spectrum?

  Ultraviolet radiation
• What is a common source of ultraviolet radiation?

  The Sun
• What can ultraviolet radiation from the Sun cause?

  Suntans and sunburns
• What is fluorescence?

  Absorption of UV light and emission of visible light
• Why do fluorescent paints appear bright?

  They emit light after absorbing UV light
• How do fluorescent lights work?

  They convert UV light into visible light
• What is a benefit of using fluorescent bulbs?

  They are energy efficient
• How can UV radiation be used for security?

  By marking property with invisible codes
• What is the purpose of using UV light on passports and banknotes?

  To detect forgeries more easily
• How does UV radiation sterilize water?

  It destroys microorganisms
• What are the main uses of visible and ultraviolet light?

  • Visible light for seeing and communication
  • Ultraviolet light for suntans, fluorescence, and security
  • UV light for sterilizing water