Class 12 Physics Electromagnetic Waves Radio Waves

Radio Waves

  • Radio waves are produced by the accelerated motion of charges in conducting wires.
  • Important application of radio waves is in:-
    • Radio and television communication systems.
    • Mobile phones for voice communication.
  • In electromagnetic spectrum the wavelength (λ) of radio waves is >0.1m.
  • Radio waves are further classified into different bands:-
    1. (Amplitude Modulated)AM band 530 kHz to 1710 kHz (lowest frequency band).They are similar to FM channels.
    2. Short wave band – up to 54MHz
    3. TV waves band – 54MHz to 890MHz
    4. (Frequency Modulated)FM band – 88MHz to 108MHz
    5. UHF band- Ultra high frequency(used for voice communication over cell phones)

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