# 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:
Plank's law
Planktan's law
Lambert's cosine law
None of these
Explanation:
No answer description is available. Let's discuss.

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
E = k (n - n0)
E = k (n + n0)
E = k (n x n0)
Explanation:
No answer description is available. Let's discuss.

8.
In which part of the reflective optical infrared region, the effect of multiple leaves in vegetation canopy is maximum ?
The near-IR (0.7 - 1.3 μm) region
The visible (0.4 - 0.7 μm) region
The short wave IR (1.3 - 2.7 μm) region
In all the above region
Explanation:
No answer description is available. Let's discuss.

9.
Which one of the following statements is correct ?
The ratio of the permitivity of a medium and the free space, is called relative permitivity.
Dielectric constant is a pure number and has no dimensions.
The dielectric constant of pure water is 80.
Higher the dielectric constant of a medium, the poorer is its electric conductivity.
All of these