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What should be the length of a half wave...

What should be the length of a half wave dipole antenna required to transmit audio frequency signals?

A

a.5 km

B

b.10 km

C

c.15 m

D

d.7.5 km

Text Solution

Verified by Experts

The correct Answer is:
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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