"All bodies at temperatures above absolute zero degree emit electromagnetic radi

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Question
"All bodies at temperatures above absolute zero degree emit electromagnetic radiation at different wave length", is known as:
Options
A. Plank's law
B. Planktan's law
C. Lambert's cosine law
D. None of these

Correct Answer

Plank's law

Elements of Remote Sensing problems

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1. The leaf area index (LAI) is :
Options
A. one sided leaf area per unit area of the ground
B. two sided leaf area per -unit area of the ground
C. the average of the two sided area per unit area of the ground
D. None of these

2. Which one of the following frequencies is a GPS?
Options
A. L₁ with frequency 1520 MHz
B. L₁ with frequency 1575.42 MHz
C. L₁ with frequency 1227.6 MHz
D. L₁ with frequency 1280.43 Hz

3. Identification of crops is affected by:
Options
A. the spectral characteristics of the sensor
B. the spatial characteristics of the sensor
C. the radio metric characteristics of the sensor
D. All of these

5. Pick up the correct statement from to following:
Options
A. For complete temporal coherence, the waves must be mono chromatic.
B. For spatial coherence, the phase difference between two points in space is constant with time.
C. Superposition of the coherent waves produce interference
D. With 0 phase difference, the constructive interference takes place.
E. All of these

7. For obtaining accurate distance of the satellite
Options
A. the GPS receiver slides its codes backwards until it synchronises with the satellite signals
B. the signal arrival time is corrected for tropospheric and ionospheric delays
C. the carrier phase measurement technique is adopted
D. All of these

8. Depending upon the nature of the targeted object and the wave length of the electromagnetic radiation incident on it, the radiation gets :
Options
A. reflected
B. absorbed
C. re-radiated
D. transmitted through
E. All of these

10. 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
Options
A. E = k (n - n₀)
B. E = k (n + n₀)
C. E = k (n x n₀)
D.

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