visible and uv light

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

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

  It appears different colors depending on the wavelength
• What is the order of colors in visible light that can be remembered using the phrase "boy G bit"?

  Red, orange, yellow, green, blue, indigo, violet
• What is the function of optical fibers?

  To transmit pulses of light over long distances
• How does light travel through optical fibers?

  It reflects off the surface and bounces back and forth
• Why must materials used in optical fibers reflect light rather than absorb it?

  To ensure that the light is transmitted efficiently without loss
• What is the advantage of using optical fibers over copper wires for data transmission?

  They can transmit much more information and are less likely to be distorted
• Where does ultraviolet radiation fall on the light spectrum?

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

  The Sun
• What is fluorescence?

  A property of certain chemicals where ultraviolet light is absorbed and re-emitted as visible light
• Why do fluorescent paints appear bright?

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

  They generate ultraviolet radiation that is absorbed by phosphorous, which then emits visible light
• What are the benefits of using fluorescent bulbs?

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

  By marking property with invisible codes that can be seen under ultraviolet light
• What is one application of ultraviolet radiation in detecting forgeries?

  It is used in passports and banknotes to make them harder to copy
• How does ultraviolet radiation sterilize water?

  By destroying microorganisms
• What are the main uses of visible and ultraviolet light?

  • Visible light:
  • Allows us to see different colors
  • Used in optical fibers for communication
  • Ultraviolet light:
  • Causes suntans and sunburns
  • Used in sun beds for artificial tanning
  • Enables fluorescence in paints and lights
  • Used for security marking and sterilizing water