Electromagnetic Field Theory
A satellite that simply reflect back the signals from one region of the earth to the other region is known as

Geostationary satellite
Orbiting satellite
Passive satellite
Active satellite

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Electromagnetic Field Theory
The wave in wave guide has

Larger wavelength than in the free space
Group velocity inversely proportional to wavelength
Larger frequency than in the free space
Diminishing wavelength than in the free space

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