(a(i))[3]
Explain what is meant by a geostationary satellite.
(a(ii))[2]
The uplink frequency for communication with the satellite is $6\,\text{GHz}$ and the downlink has a frequency of $4\,\text{GHz}$. Explain why these frequencies are not the same.
(b)[3]
Comment on the time delays experienced by the two people when they communicate either by geostationary satellites or by optic fibres. Explain your answer.