An antenna serves the following purpose :

Converts AF wave to RF wave

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Converts RF signal into electromagnetic energy

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Converts the guided EM waves into free space EM waves and vice versa

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Superimposes AF wave on RF wave

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Solution

The correct option is C Converts the guided EM waves into free space EM waves and vice versa
The antenna serves as the region of transition between guided and free space propagation.

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\to E = \to i 30 cos (k z - 5 \times 10^{8} t)

\to E

V / m

k

= 3 \times 10^{8} m / s

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