maths Maths Puzzle

Q. When a dipole antenna of l/8 length has an equivalent total loss resistance of 1.5 W then the efficiency of the antenna is

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Q. When a dominant mode wave guide not terminated in its characteristic impedance is excited with a 10 GHz signal then if d is the distance between two successive minima of the standing wave in the guide then Q. In commercial FM broadcasting, the maximum frequency deviation is normally