Civil Engineering - Elements of Remote Sensing

Exercise :: Elements of Remote Sensing - Section 3

6. 

"All bodies at temperatures above absolute zero degree emit electromagnetic radiation at different wave length", is known as:

A. Plank's law
B. Planktan's law
C. Lambert's cosine law
D. None of these

Answer: Option A

Explanation:

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7. 

Assuming n as the frequency of radiation, n0 as the threshold frequency and k as a constant, the energy of the photo-electrons (E) is related as

A. E = k (n - n0)
B. E = k (n + n0)
C. E = k (n x n0)
D.

Answer: Option A

Explanation:

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8. 

In which part of the reflective optical infrared region, the effect of multiple leaves in vegetation canopy is maximum ?

A. The near-IR (0.7 - 1.3 μm) region
B. The visible (0.4 - 0.7 μm) region
C. The short wave IR (1.3 - 2.7 μm) region
D. In all the above region

Answer: Option A

Explanation:

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9. 

Which one of the following statements is correct ?

A. The ratio of the permitivity of a medium and the free space, is called relative permitivity.
B. Dielectric constant is a pure number and has no dimensions.
C. The dielectric constant of pure water is 80.
D. Higher the dielectric constant of a medium, the poorer is its electric conductivity.
E. All of these

Answer: Option E

Explanation:

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10. 

The energy transported by the electromagnetic wave is proportional to :

A. the altitude of the wave
B. the square of the altitude of the wave
C. the cube of the altitude of the wave
D. the square roof of the amplitude

Answer: Option B

Explanation:

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