THE BEST!!!

• Which colour has the lowest frequency and longest wavelength?

  RED 💔
• Which colour has the highest frequency and shortest wavelength?

  Violet
• What are radio waves produced by?

  Oscillations is electrical circuits
• What are used to receive radio waves?


  A metal rod or wire can be used as an aerial
• What are some uses of ultraviolet light?


  Security markings, low energy light bulbs
• How can ultraviolet light be used in security markings?


  Some materials absorb ultraviolet radiation and re-emit it as visible light, which is called fluorescence, and these fluorescents can be shined on security markings which are only visible when ultraviolet light shines on them
• What can too much exposure to ultraviolet do?


  Skin cancer
• What can too much infrared radiation cause?

  Damage or destroy cells, causing burns to the skin
• What can excessive exposure to X-rays or gamma rays cause?


  Mutations in the dna that can kill cells or cause cancer
• DIVERGING LENS


  DIVERGING LENS

  
• Converging lens


  Converging lens

  
• What does a converging lens do to rays of light?


  Shortens the focal point and converges the rays of light
• What does a diverging lens do?


  Causes the rays of light to spread out
• Is a converging lens convex or concave?

  Convex