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

A. Focal length B. Flying height C. Ground elevation D. None of these

A. Absorption by the dissolved material B. Absorption by the suspended particulate matter C. Scattering by the suspended particulate matter D. All of these

A. 0.4 - 0.7 μm B. 0.5 mm to 1 μm C. 0.7 - 1.3 μm D. 0.7 to 14 μm

A. $$\frac{\pi }{4}$$ B. $$\frac{\pi }{2}$$ C. $$\pi $$ D. $$\frac{{3\pi }}{2}$$