Answer:
TV signals being of high frequency range, 100-220 MHz, cannot be reflected by ionosphere. Also ground wave transmission is possible only up to a limited range. That is why satellites are used for long distance TV transmission. The transponders in a satellite receive these signals and transmit them towards different ground stations. Numerical: Minimum distance, \[\text{s }=2h=\text{ 2 }\times \text{ 36}000\text{ km}\] \[=\text{ 72}000\text{ km}\]
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