(a(i))[1]
Suggest the material that the component labelled $A$ in Fig. 11.1 is made from.
(a(ii))[2]
Suggest two functions of the component labelled $A$.
(b(i))[1]
As a signal travels along the coaxial cable, it is attenuated. State the meaning of attenuation.
(b(ii))[2]
State and explain why attenuation is often measured in decibels ($\text{dB}$).
(c)[3]
A television aerial is linked to a receiver by a coaxial cable that is $11\,\text{m}$ long. The cable has an attenuation per unit length of $190\,\text{dB km}^{-1}$. Calculate the ratio $$\frac{\text{output signal from coaxial cable}}{\text{input signal to coaxial cable}}.$