ELEMENTS OF REMOTE SENSING QUIZ

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 = 1/εμ

None of these

Cm = 5/√εμ

TRUE ANSWER : ?
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While propagating through homogeneous, isotropic media,

Both (A) and (B)

Both the fields are at right angles to the direction of propagation

Directions of both the fields are orthogonal

Neither (A) nor (B)

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Earth observations from a satellite platform provide:

All of these

Synoptic view of a large area

Repetitive observations of the same area with intervals of a few minutes to a few weeks

Constant solar zenith angles and similar illumination conditions

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

500 km

250 km

130 km

230 km

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A perfectly black body:

Emits power of every wave length

All listed here

Is a diffuse emitter

Absorbs all the radiations of every wave lengths

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The various stages occuring in GPS system are described below: 1. Generation of an output to the user 2. Detection of the GPS signals 3. Processing the data in the built-in-computer 4. Decoding the GPS signal. The correct sequence of the stages is:

2, 4, 3, 1

2, 3, 4, 1

1, 2, 3, 4

3, 1, 2, 4

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Due to perturbation of the orbit, satellite orbit parameters are frequently updated on measurements carried out by its

Six ground stations

Three ground stations

Four ground stations

Five ground stations

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The value of energy quantum for radiation of any frequency is proportional to:

The square of the frequency

The square root of the frequency

The reciprocal of the energy

The frequency

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Which one of the following relationship between the wave length (λ), and frequency and the speed (C) of the electromagnetic wave is correct?

C = λ/v

C = 1/λv

C = vλ

C = v + λ

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Geodimeter is based on:

Propagation of modulated light waves

Propagation of infrared radiation

High frequency radio waves

The visible light as carrier with frequency of the order of 5 × 1014 Hz

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