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Elements Of Remote Sensing

Elements Of Remote Sensing
In the given figure the phase of

B crossing is π
Trough C is 3π/2
All of these
Crest A is π/2

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Elements Of Remote Sensing
A perfectly black body:

Is a diffuse emitter
Absorbs all the radiations of every wave lengths
All listed here
Emits power of every wave length

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Elements Of Remote Sensing
Rayleigh's criteria for a rough surface is: (where letters carry their usual meanings).

h < λ/8 cos θ
h > λ/8 cos θ
h > λ/Δ cos θ
h = λ/8 cos θ

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Elements Of Remote Sensing
Which one of the following factors does not affect the scale of the air photographs?

Ground elevation
None of these
Flying height
Focal length

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Elements Of Remote Sensing
Coherence of two electromagnetic waves takes place if their phase difference is:

None of these
Constant in time and space
Constant in space
Constant in time

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

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