Civil Engineering - Elements of Remote Sensing

Exercise :: Elements of Remote Sensing - Section 2

31. 

Pick up the correct statement from the following :

A. Frequency is the number of wave crests passing a fixed point in one second
B. Frequency of a wave is measured in Hertz (Hz)
C. Amplitude of a wave is the height of its crust from the mid-point.
D. The square of the amplitude is proportional to the energy transported by the wave.
E. All of these

Answer: Option E

Explanation:

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32. 

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 :

A.
B.
C.
D. None of these

Answer: Option B

Explanation:

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33. 

Earth observations from a satellite platform provides :

A. synoptic view of a large area
B. constant solar zenith angles and similar illumination conditions.
C. repetitive observations of the same area with intervals of a few minutes to a few weeks
D. All of these

Answer: Option D

Explanation:

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34. 

Due to scan geometery of a satellite sensor:

A. the off-nadir resolution is degraded
B. the ground distance swept by the senor, IFOV is proportional to sec2θ, where θ is the angle of scan measured from the nadir
C. the details towards the edge of the scan get compressed
D. All of these

Answer: Option D

Explanation:

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35. 

'A time varrying electric field produces a magnetic field.' This phenemenon is called:

A. Hertz's law
B. Ampere Maxwell's law
C. Faraday's law
D. Kirchoff s law

Answer: Option B

Explanation:

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