The diagram shows a dish antenna which is used to receive televisiton signals form a satellite. The antenna (signal detector ) is fixed forn of the curved dish .

What is the shape of the 'dish' of a dish antenna used for receiving TV signals from a satellite ?

find the minimum coaltitude which can directly receive a signal from a geostationary satellite.

find the minimum colatitude which can directly receive a signal from a geostationary satellite.

Why are dish antennas curved?

Name the device fitted in the satellite which receives signals from Earth station and transmits them in different directions after amplification.

Name the device fitted in the satellite which receives signals from Earth station and transmits them in different directions after amplification.

I=(P)/(4pi r^(2)) At a large distance r from a radio antenna, the intensity of the radio signal I is related to the power of the signal P by the formula above. Which of the following expresses the square of the distance from the radio antenna in terms of the intensity of the radio signal and the power of the signal?