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If sound waves of frequency 20 KHz are to be transmitted directly, then the length of the dipole antenna required isA. 3.75 kmB. 15 kmC. 7.5 kmD. 20 km |
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Answer» Correct Answer - C `lambda=c/f=(3xx10^8)/(20xx10^3) =15xx10^3` m = 15 km `therefore` the required length of the antenna `=lambda/2`=7.5 km |
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