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Elements Of Remote Sensing

Elements Of Remote Sensing
Orbital radius of GPS satellites is approximately:

15,200 km
36,000 km
18,400 km
26,600 km

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Elements Of Remote Sensing
Which one of the following quantities forms the basis of radiometry?

Radiant energy (Q)
Radiant intensity (I)
Radiant flux (φ)
All of these

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Elements Of Remote Sensing
For C band Synthetic Aperture Radar (SAR) with Doppler band width of 1300 Hz, the coherence length loch is:

500 km
230 km
130 km
250 km

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Elements Of Remote Sensing
Critical angle of electromagnetic radiation takes place if

Angle of refraction is equal to 90°
Angle of incidence is equal to angle of refraction
Angle of incidence is equal to 90°
Angle of incidence is greater than the angle of refraction

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Elements Of Remote Sensing
'A time varying electric field produces a magnetic field.' This phenomenon is called:

Ampere Maxwell's law
Faraday's law
Hertz's law
Kirchoff’s law

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Elements Of Remote Sensing
The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:

Active sensors
Sensors
Passive sensors
None of these

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