1. TELECOM V = f x m/s hzm V is speed,f is frequency  is wavelength

2. TELECOM v =d/t v =d/t v is speed in m/s v is speed in m/s d is distance in m d is distance in m t is time ins t is time ins

3. TELECOM Radio waves are carried from transmitter by the carrier wave. Radio waves are carried from transmitter by the carrier wave. Speed of radio waves is Speed of radio waves is 300,000,000m/s 300,000,000m/s

4. TELECOM The main parts of a radio receiver are The main parts of a radio receiver are Aerial – receives all signals Aerial – receives all signals Tuner – tunes into one particular signal Tuner – tunes into one particular signal

5. TELECOM Decoder – separates the carrier wave from the audio (sound ) wave Decoder – separates the carrier wave from the audio (sound ) wave Amplifier gives a bigger copy of the audio wave Amplifier gives a bigger copy of the audio wave

6. TELECOM LOUDSPEAKER TURNS THE ELECTRICAL SIGNAL INTO SOUND DIFFERENT RADIO STATIONS ARE IDENTIFIED BY THE CARRIER WAVE FREQUENCY

7. SPACE Radio waves are detected by large curved dishes similar to the dish aerials in T.V. systems Radio waves are detected by large curved dishes similar to the dish aerials in T.V. systems