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Elements Of Remote Sensing

Elements Of Remote Sensing
The reflectance from a surface is called specular reflection if it follows:

Planktan
Snell’s law
All of these
Lambert

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

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

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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:

250 km
500 km
130 km
230 km

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Elements Of Remote Sensing
Electromagnetic spectrum contains:

Ultraviolet rays (wave length < 10⁻⁶ m)
Infrared rays (wave length < 10⁻⁴ m)
Gamma rays (wave length < 10⁻¹⁰ m)
All of these

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Elements Of Remote Sensing
If electric permittivity and magnetic permeability of the medium are respectively ‘ε’ and ‘μ’, then the velocity (Cm) of the electromagnetic wave in the medium is given by:

Cm = 1/εμ
None of these
Cm = 5/√εμ
Cm = 1/√8 μ

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Elements Of Remote Sensing
Leaf reflectance depends primarily on:

The pigments
All of these
Internal cell structure
Equivalent water content

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