Elements Of Remote Sensing
The interaction of the electromagnetic radiation produced with a specific wave length to illuminate a target on the terrain for studying its scattered radiance, is called:

Active remote sensing
Neutral remote sensing
None of these
Passive remote sensing

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Elements Of Remote Sensing
Geodimeter is based on:

The visible light as carrier with frequency of the order of 5 × 1014 Hz
High frequency radio waves
Propagation of modulated light waves
Propagation of infrared radiation

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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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