Propagation Modes
Sky wave propagation relies on reflection by:
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More communication systems Practice Questions
In AM, carrier amplitude varies proportional to:
In AM, carrier amplitude varies proportional to:
Bandwidth of AM signal equals:
Bandwidth of AM signal equals:
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Random undesirable variation in signal is termed:
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Geostationary satellite orbits Earth with period equal to:
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In FM, which parameter of carrier varies with modulating signal?
In FM, which parameter of carrier varies with modulating signal?
Signal loss over distance in channel is termed:
Signal loss over distance in channel is termed:
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Higher SNR implies received signal quality is:
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According to Shannon, channel capacity increases with bandwidth and:
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Repeaters in long communication lines primarily:
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About This Question
- Subject
- physics
- Chapter
- communication systems
- Topic
- propagation modes
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Ionosphere
Sky wave propagation involves radio waves (typically in the frequency range of 3 MHz to 30 MHz) that are directed towards the sky and reflected back to Earth by the ionosphere. The ionosphere consists of stratified layers of ionized gases at high altitudes. This mode of propagation enables 'over-the-horizon' or long-distance communication as the waves 'skip' between the ionosphere and the Earth's surface.
This medium difficulty physics question is from the chapter communication systems, covering the topic of propagation modes. It appeared in the 2025 exam.
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