We do not transmit low frequency signal to long distances because-
(A) The size of the antenna should be comparable to signal wavelength which is unreal
(B) Effective power radiated by a long wavelength baseband signal would be high.
(C) We want to avoid mixing up signals transmitted by different transmitter simultaneously.
(D) Low frequency signal can be sent to log distances by superimposing with a high frequency wave as well.
Therefore, the most suitable options will be
We do not transmit low frequency signal to long distances because-
(A) The size of the antenna should be comparable to signal wavelength which is unreal
(B) Effective power radiated by a long wavelength baseband signal would be high.
(C) We want to avoid mixing up signals transmitted by different transmitter simultaneously.
(D) Low frequency signal can be sent to log distances by superimposing with a high frequency wave as well.
Therefore, the most suitable options will be
Option 1 -
(A), (B) and (C) are true only
Option 2 -
(A) , (C) and (D) are true only
Option 3 -
(A), (C) and (D) are true only
Option 4 -
(B), (C) and (D) are true only
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1 Answer
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Correct Option - 4
Detailed Solution:For high wavelength, size of antenna should be high.
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According to question, we can write
Increment in height of tower = h2 – h1 = 500 – 125 = 375 m
Low pass filter will allow low frequency signal to pass while high pass filter allow high frequency to pass through
µ = A? /A? = 0.5 {A? = 20 volt, A? = 40 volt}
m (t) = A? sin ω? t {ω? = 2π×10? }
c (t) = A? sin ω? t {ω? = 2π×10×10³}
C? (t) = (A? + A? sin ω? t) sin ω? t ⇒ A? {1+ µsin ω? t} sin ω? t
Kindly consider the following figure
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