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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

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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 $(D)$.

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

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