Correct Answer : Option (D) : photo conduction
Explanation : Photo conduction uses the fact that resistivity of some materials depends on intensity of light falling on their surface.
Correct Answer : left to right
Correct Answer : Fading
Explanation : Tropospheric scatter propagation is subject to two types of fading called Rayleigh fading (due to multipath propagation) and fading due to variations in atmospheric conditions along the propagation path.
Correct Answer : 13 mm