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If sound waves of frequency 20 KHz are t...

If sound waves of frequency 20 KHz are to be transmitted directly, then the length of the dipole antenna required is

A

A. 3.75 km

B

B. 15 km

C

C. 7.5 km

D

D. 20 km

Text Solution

Verified by Experts

The correct Answer is:
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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