# Civil Engineering - Elements of Remote Sensing

### Exercise :: Elements of Remote Sensing - Section 1

26.

The value of energy quantum for radiation of any frequency is proportional to :

 A. the frequency B. the reciprocal of the energy C. the square of the frequency D. the square root of the frequency

Explanation:

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27.

The phase difference of the waves 1 and 2 at A in the given figure is : A. π/4 B. π/2 C. π D. 3π/2

Explanation:

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28.

A perfectly black body :

 A. is a diffuse emitter B. absorbs all the radiations of every wave lengths C. emits power of every wave length D. All the above

Explanation:

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29.

Pick up the correct statement from the following :

 A. When the electric field oscillates in the direction of the electric vector, a plane polarised wave is formed. B. When the electric vector is in the plane of incidence, vertical polarisation is formed. C. When the electric vector is at right angles to the plane of incidence, horizontal polarization wave is formed. D. The plane containing the incident ray and normal to the reflecting surface at the point of incidence is called the plane of incidence. E. All of these

Explanation:

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30.

Pick up the correct statement from the following:

 A. Phase of a wave is expressed as a fraction of a period with respect to a refrence B. Phase is usually specified by angular measure with one period being 360° C. The reference for finding the phase of a wave is taken from the previous passage through zero from the negative to the positive direction. D. All of these