Which of the following is true for a geostationary satellite?
A. It appears fixed relative to a point on Earth
B. Its orbital period is 12 hours
C. It revolves opposite to Earth's rotation
D. Its orbit is at any altitude
Answer: Option A
Solution (By JKSSB Mock Tests)
Geostationary satellite has orbital period equal to Earth's rotation (24 hours) and orbits in equatorial plane in same direction. It appears stationary from Earth's surface. Altitude about 36,000 km. Used for communication.
Explanation:
Speed of sound: solids > liquids > gases. In steel ~5000 m/s, water ~1500 m/s, air ~340 m/s. Vacuum no propagation. Speed depends on density and elasticity.
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