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V = f x V = f x

m/s

hz m

V is speed ,f is frequencyis wavelength

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v =d/tv =d/tv is speed in m/sv is speed in m/sd is distance in md is distance in m

t is time inst is time ins

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Radio waves are carried Radio waves are carried from transmitter by the from transmitter by the

carrier wave.carrier wave.Speed of radio waves is Speed of radio waves is

300,000,000m/s300,000,000m/s

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The main parts of a radio The main parts of a radio receiver arereceiver are

Aerial – receives all Aerial – receives all signalssignals

Tuner – tunes into one Tuner – tunes into one particular signalparticular signal

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Decoder – separates Decoder – separates the carrier wave from the carrier wave from

the audio (sound ) wavethe audio (sound ) waveAmplifier gives a bigger Amplifier gives a bigger copy of the audio wave copy of the audio wave

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LOUDSPEAKER TURNS THE LOUDSPEAKER TURNS THE ELECTRICAL SIGNAL INTO ELECTRICAL SIGNAL INTO

SOUNDSOUNDDIFFERENT RADIO STATIONS DIFFERENT RADIO STATIONS

ARE IDENTIFIED BY THE ARE IDENTIFIED BY THE CARRIER WAVE FREQUENCYCARRIER WAVE FREQUENCY

SPACESPACE

Radio waves are detected by large Radio waves are detected by large curved dishes similar to the dish curved dishes similar to the dish

aerials in T.V. systemsaerials in T.V. systems