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(D) In amplitude modulation, a low-frequency message signal (modulating signal) is superimposed on a high-frequency carrier wave.$1$. The amplitude of

Vedclass · Accepted Answer

Wave $(D): A_m  <  A_C, \omega_m  <  \omega_C$

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(D) In amplitude modulation, a low-frequency message signal (modulating signal) is superimposed on a high-frequency carrier wave.$1$. The amplitude of the modulating signal $(A_m)$ must be less than the amplitude of the carrier wave $(A_C)$ to avoid over-modulation, which causes distortion. Thus, $A_m  $2$. The frequency of the modulating signal $(\omega_m)$ must be much lower than the frequency of the carrier wave $(\omega_C)$ for efficient transmission and to ensure the carrier wave can effectively carry the information. Thus, $\omega_m  Therefore, the correct condition is $A_m  <  A_C$ and $\omega_m  <  \omega_C$, which corresponds to Wave $(D)$.

Column $A$	Column $B$
$A$. $D$-layer	$I$. $250-400 \ km$
$B$. $E$-layer	$II$. $170-190 \ km$
$C$. $F_1$-layer	$III$. $95-120 \ km$
$D$. $F_2$-layer	$IV$. $65-75 \ km$

For amplitude modulated wave broadcast, which of the following conditions is suitable?

Similar Questions

Match Column $A$ (layers in the ionosphere for skywave propagation) with Column $B$ (their height range).
Column $A$ Column $B$
$A$. $D$-layer $I$. $250-400 \ km$
$B$. $E$-layer $II$. $170-190 \ km$
$C$. $F_1$-layer $III$. $95-120 \ km$
$D$. $F_2$-layer $IV$. $65-75 \ km$

The maximum usable frequency $(MUF)$ in the $F$-region layer is $x$,when the critical frequency is $60 \, MHz$ and the angle of incidence is $70^\circ$. Then $x$ is ....... $MHz$.

Indicate which one of the following systems is digital.

$A$ transmitting antenna is kept on the surface of the earth. The minimum height of the receiving antenna required to receive the signal in line-of-sight at $4\,km$ distance from it is $x \times 10^{-2}\,m$. The value of $x$ is (Let radius of earth $R = 6400\,km$).

The process of retrieval of information from the carrier wave is known as:

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