Two people, living in different regions of the Earth, communicate either using a link provided by a geostationary satellite or using optic fibres.
Explain what is meant by a geostationary satellite.
The uplink frequency for communication with the satellite is 
and the downlink has a frequency of 
. Explain why the frequencies are different.
Comment on the time delays experienced by the two people when communicating either using geostationary satellites or using optic fibres. Explain your answer.
