The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:

The instruments which provide electromagnetic radiation of specified w

1.	The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:
A.	ensors
B.	assive sensors
C.	ctive sensors
D.	one of these
Answer» D. one of these

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The instruments which provide electromagnetic radiation of specified wave length or a band of wave lengths to illuminate the earth surface are called:

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