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What should be the length of a half wave dipole antenna required to transmit audio frequency signals?A. a.5 kmB. b.10 kmC. c.15 mD. d.7.5 km |
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Answer» Correct Answer - D Audio signals have a frequency range of 20 Hz to 20 KHz `=20xx10^3` Hz `therefore f=20 xx 10^3` Hz The corresponding wavelength `lambda=c/f=(3xx10^8)/(20xx10^3)=(300xx10^6)/(20xx10^3) = 15xx10^3` m = 15 km `therefore` Length of the antenna =`lambda/2` = 7.5 km |
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