(a(i))[1]
Suggest one application in which signals are transmitted through a wire pair.
(a(ii))[1]
Suggest one application in which signals are transmitted through a coaxial cable.
(a(iii))[1]
Suggest one application in which signals are transmitted using a microwave link.
(b(i))[3]
A cable carrying a signal has an attenuation per unit length of $2.1\,\text{dB km}^{-1}$. There are no amplifiers in the cable. The signal input power is $450\,\text{mW}$. Calculate the output power of the signal for a cable length of $40\,\text{km}$.
(b(ii))[2]
The least acceptable signal power in the cable is $7.2 \times 10^{-11}\,\text{W}$. Calculate the maximum uninterrupted length of the cable.