ANSWERS: 2
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A receiver receives transmissions (in this case radio transmissions) and an amplifier makes the sounds loud enough to hear (amplifies them).
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"an amplifier: a natural or artificial device intended to make a signal stronger." Source: http://en.wikipedia.org/wiki/Amplify "Receiver (radio): an electronic device that converts a radio signal from a transmitter into useful information " "Receiver (information theory), the receiving end of a communications channel " Source: http://en.wikipedia.org/wiki/Receiver
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