The time period of a geostationary satellite is:

CONCEPT:

Geostationary satellite:

• A satellite whose time period is 24 hours and is revolving in an orbit concentric and coplanar with the equatorial plane of earth is called geostationary satellite.
• The geostationary satellite revolves at the height of about 36000 km from the surface of the earth.
• The orbital velocity of the geostationary satellite is about 3.08 km/sec.

EXPLANATION:

• A satellite whose time period is 24 hours and is revolving in an orbit concentric and coplanar with the equatorial plane of earth is called geostationary satellite. Hence, option 3 is correct.