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An audio signal of frequency va is to be...

An audio signal of frequency `v_a` is to be transmitted as an electormagnetic wave (i) directly as such (ii) through its use as modulating signal on a carrier wave of frequency `v_c`. State the ratio of the size of antenna that can properly sense the time variation of the signal.

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As size of antenna `prop (1)/("Frequency")`
`:.` Required ratio ` = v_(c ) : v_( a )`
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