Q. Out of the following, the only correct statement about satellites is
A) A satellite cannot move in a stable orbit in a plane passing through the earth’s centre
B) Geostationary satellites are launched in the equatorial plane
C) We can use just one geostationary satellite for global communication around the globe
D) The speed of satellite increases with an increase in the radius of its orbit
Explanation
(b) Orbital speed, $v_{0} = \sqrt{\frac{GM}{r}}$; so speed of satellite decreases with the increase in the radius of its orbit. We need more than one satellite for global communication. For stable orbit it must pass through the centre of earth. So, only (b) is correct
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.