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If the frequency of the carrier wave is ...

If the frequency of the carrier wave is increased from 10 MHz to 100 MHz, the length of the half wave dipole antenna required for transmission

A

a.increases

B

b.decreases

C

c.remains constant

D

d.will be doubled

Text Solution

Verified by Experts

The correct Answer is:
B
The length of the dipole antenna `l=c/"2f"`
(`because lambda=c/f` and `l=lambda/2`)
`because lprop 1/f therefore`l decreases as f increases
[`l_1=(3xx10^8)/(2xx10xx10^6)=1.5xx10`=15 m for 10 MHz `l_2=(3xx10^8)/(2xx100xx10^6)`=1.5 m for 100 MHz]
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