UV 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 is visible light used for communication?

  Through optical fibers transmitting light pulses
• Why do optical fibers transmit light effectively?

  Light reflects and bounces within the fiber
• What is required for effective light transmission in optical fibers?

  Materials that totally reflect light
• What type of reflection is necessary for optical fibers?

  Specular reflection
• What is a key advantage of optical fibers over copper wires?

  They transmit more information with less distortion
• Where does ultraviolet radiation fall on the spectrum?

  After violet
• What is a common source of ultraviolet radiation?

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

  Suntans and sunburns
• How can we generate ultraviolet radiation artificially?

  Using sun beds
• What is fluorescence?

  Ultraviolet light absorbed and emitted as visible light
• Why do fluorescent paints appear bright?

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

  They generate UV radiation absorbed by phosphor
• What is the benefit of using fluorescent bulbs?

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

  With special pens that mark invisible codes
• What is a common application of UV radiation in security?

  Marking passports and banknotes
• How does UV radiation help in detecting forgeries?

  It makes invisible marks visible under UV light
• What is one use of UV radiation in water treatment?

  To sterilize water by destroying microorganisms
• What does UV radiation do to microorganisms?

  Destroys them
• What are the main uses of visible and ultraviolet light?

  • Communication via optical fibers
  • Fluorescence in paints and lights
  • Security marking with UV pens
  • Sterilization of water