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

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

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Elements Of Remote Sensing
Earth observations from a satellite platform provide:

Repetitive observations of the same area with intervals of a few minutes to a few weeks
Synoptic view of a large area
Constant solar zenith angles and similar illumination conditions
All of these

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Elements Of Remote Sensing
Which one of the following statement is correct?

Radiant energy expressed in Joules, is the energy associated with electromagnetic radiation
All of these
The radiant energy which falls upon a surface is termed as irradiance
The rate of transfer of radiant energy is called flux and is expressed in watts

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