260. The radius of the Earth is
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261. The orbital period of a satellite is proportional to
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262. For a satellite with time period of 2 hours, the height above the surface must be
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263. Moon completes one orbit in
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264. Long distance communication system via satellite uses frequency in the range
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265. A system has poles at 0.01 Hz, 1 Hz and 80 Hz; zeros at 5 Hz and 200 Hz. The approximate phase of the system response at 20 Hz is
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266. A mW video signal having a bandwidth of 100 MHz is transmitted to a received through a cable that has 40 dB loss, lithe effective one-sided noise spectral density at the receiver is 10-20 Watt/Hz, then the signal-to-noise ratio at the receiver is
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