Question

The minimum number of satellites needed to be placed for world-wide communication between any two locations on earth's surface is:

• A. 6
• B. 4
• C. 3
• D. 5

Answer 1

Answer: (C)

3

For a world-wide communication between any two locations of the earth, minimum 3 satellites must be placed such that each pair of the satellites subtend angle of ${120}^o$ at the centre of earth.