Elements Of Remote Sensing
Pick up the important characteristic of a target which facilitates its identification from the following:

Spectral variation
Spatial variation
Temporal variation
All of these

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Elements Of Remote Sensing
Which one of the following statement is incorrect regarding the electromagnetic radiation?

None of these
These are produced by the motion of electric charge
The changing electric fields induce the changing magnetic fields in the surrounding medium
The oscillation of charged particles sets up changing electric fields

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