Match List I with List II:

List 1

1. Attenuation

2. Transducer

3. Demodulation

4. Repeater

List 2

1. I. Combination of a receiver and transmitter

2. II. Process of retrieval of information from the carrier wave at receiver

3. III. Converts one form of energy into another

4. IV. Loss of strength of a signal while propagating through a medium