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

Active satellite
Orbiting satellite
Geostationary satellite
Passive satellite

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Electromagnetic Field Theory
A rectangular waveguide is a

Tube antenna to transmit and receive electromagnetic waves
Hollow rectangular walled room carrying electromagnetic wave
Rectangular conducting wire to propagate electromagnetic waves
Hollow rectangular conducting tube through which electromagnetic waves can be propagat-ed

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Electromagnetic Field Theory
The wave in wave guide has

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

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