| List I | List II |
|---|---|
| A. Attenuation | I. Combination of a receiver and transmitter. |
| B. Transducer | II. Process of retrieval of information from the carrier wave at received |
| C. Demodulation | III. Converts one form of energy into another |
| D. Repeater | IV. Loss of strength of a signal while propagating through a medium |