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?

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

  It reflects every time it hits the surface, bouncing 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?

  Optical fibers can transmit much more information and are less likely to distort signals
• What comes after violet in the electromagnetic spectrum?

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

  The Sun
• What is one use of ultraviolet radiation mentioned in the video?

  To give us a suntan or sunburn
• What is fluorescence?

  It is the property of certain chemicals to absorb ultraviolet light and emit visible light
• How do fluorescent paints appear bright?

  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 is a benefit of using fluorescent bulbs?

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

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

  It is used in passports and banknotes
• How does UV radiation sterilize water?

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

  • Communication using optical fibers
  • Fluorescence in paints and lights
  • Security applications with invisible codes
  • Sterilization of water