To radiate a wave of frequency 1 text{ kHz} e | vedclass

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(C) The frequency of the wave is $f = 1 	ext{ kHz} = 10^{3} 	ext{ Hz}$.The speed of light is $c = 3 	imes 10^{8} 	ext{ m/s}$.The wavelength $\lamb

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$75$

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(C) The frequency of the wave is $f = 1 	ext{ kHz} = 10^{3} 	ext{ Hz}$.The speed of light is $c = 3 	imes 10^{8} 	ext{ m/s}$.The wavelength $\lambda$ is given by $\lambda = \frac{c}{f} = \frac{3 	imes 10^{8}}{10^{3}} = 3 	imes 10^{5} 	ext{ m}$.For efficient radiation,the minimum length of the antenna should be $\frac{\lambda}{4}$.Minimum length $L = \frac{\lambda}{4} = \frac{3 	imes 10^{5}}{4} 	ext{ m} = 0.75 	imes 10^{5} 	ext{ m} = 75 	imes 10^{3} 	ext{ m} = 75 	ext{ km}$.

To radiate a wave of frequency $1 \text{ kHz}$ efficiently,what should be the minimum length of the antenna in $km$?

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