Electromagnetic Waves

Electromagnetic Waves

1. Characteristics

   • Transverse Waves
   • Do not require a medium to travel
   • Transfer energy from one place to another
   • All travel at same speed (3.0 x10^8 m/s)
   • Obeys the laws of reflection and refraction
   • Wave equation is applicable : Velocity (v) = Frequency (f) x Wavelength (入)

2. Types of EM waves

   • (Shortest Wavelength, Highest frequency) Gamma Ray
     • Wavelength: (10^-11m)
     • Applications: Cancer treatment
   • X-Ray
     • Wavelength: (10^-10m)
     • Applications: Detect Bone Fractures
   • Ultraviolet Rays
     • Wavelength: (10^-8m)
     • Applications: Sterilisation of Tools
   • Visible Light
     • Wavelength: (10^-7m)
     • Applications: Optical Fibres
       • Tube covering glass material must be <dense than glass (total internal refraction)
   • Infrared Rays
     • Wavelength: (10^-4m)
     • Applications: Remote Control
   • Microwaves
     • Wavelength: (10^-2m)
     • Applications: Microoven
   • Radio Waves
     • Wavelength: (10^-1m and above) (Longest wavelength, Lowest Frequency)
     • Applications: Radio Communication