11. Which one of the following frequency regions is a part of sun's radiation?
12. The refractive index of the ocean water:
13. The changes in the reflectivity/emissivity with time, is called:
14. Rayleigh's criteria for a rough surface is: (where letters carry their usual meanings).
15. Which one of the following relationship between the wave length (λ), and frequency and the speed (C) of the electromagnetic wave is correct?
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