defence exam CRPF ASI Technical Mock Test 2023 Electronic Mechanic Communications and Radio Transmission Radio Wave Propagation and Antennas
What does the term "impedance" refer to in the context of radio engineering?
1
The amount of radio waves that a material can absorb
2
The opposition that a circuit presents to current when a voltage is applied
3
The number of times a wave oscillates in one second
4
The rate at which work is done, or the amount of work done per unit of time