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Sound is produced by making (1) vibrations. The force of impact between the two bodies and vibrations of bodies cause the (2) air molecules around them to vibrate. (3) sound energy is converted into electrical energy using diaphragm present in the microphone and these signals then reach to the speakers and then converted back to sound. The sound is used as (4) communication to relay meanings. The (5) sonar is an echo sounding device that uses sound propagation.