A radar sends slow moving a signal of frequency 8 109 hz towards an aircraft approaching the radar. Of the reflected wave shows frequency shift 2 103 hz, the speed with which the aircraft is approaching the radar is (velocity of radar signal is 3 108 m/s)
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This set of Electromagnetic Theory Multiple Choice Questions & Answers (MCQs) focuses on “Phase and Group Velocity”.
1. In a waveguide, which of the following condition is true always?
a) phase velocity = c
b) group velocity = c
c) phase velocity > c
d) phase velocity < c
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Answer: c
Explanation: The phase velocity is always greater than the speed of light in waveguides. This implies the group velocity is small.
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