SOLAR SYSTEM

Detailed explanation-1: -We know that (time period)2∝(orbital radius)3. Therefore, time period is longer in case of a satellite revolving away from the surface of Earth.

Detailed explanation-2: -Therefore, the time period is longer in the case of satellites revolving away from the surface of the earth.

Detailed explanation-3: -Does the period of a satellite in a circular orbit increase or decrease as its distance from Earth increases? As the distance increases, the period increases. The farther the distance, the longer the period. This is true for any satellite around a center.

Detailed explanation-4: -The satellite revolves around the earth, and at the same time earth revolves around the sun; that is why it remains stationary concerning a particular point. The communication satellite is geostationary, and therefore its time period is 24 hours.

Detailed explanation-5: -The higher the altitude, the further it has to travel around the Earth and the longer it thus takes. Satellites in low Earth orbit (say 300 kilometres) perform one orbit in around 90 minutes. By the time we are at geostationary altitudes (about 36000 kilometres) one orbit takes 24 hours.