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Q93 (IAS/2005) Science & Technology › Space & Defence Technology › Orbital mechanics and orbits Answer Verified

Consider the following statements: 1. A geostationary satellite is at an approximate height of 10000 km. 2. FM transmission of music is of very good quality because the atmospheric or man-made noises which are generally frequency variations can do little harm. Which of the statements is/are correct?

Result
Your answer: —  Â·  Correct: D
Explanation

Both statements are incorrect. A geostationary satellite must orbit at about 35,786 km above Earth (≈36,000 km), not near 10,000 km, to match Earth's rotation and remain fixed over a point on the equator [1]. FM broadcasting does provide superior music quality because frequency modulation is largely immune to amplitude-type noise (atmospheric and man-made impulses) and allows wider bandwidth and stereo transmission; however the given claim that such noises are generally frequency variations is wrong—if noise were predominantly frequency variations FM would be adversely affected. Thus the reasoning in statement (2) is flawed even though FM does resist common amplitude noise.

Sources

  1. [1] https://nstxl.org/low-earth-orbit-explained/
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