Basically,the product modulator is

$A$ signal of $100 \,THz$ frequency can be transmitted with maximum efficiency by

If a receiving station on the ground is receiving a frequency of $10 \text{ MHz}$, the mode of propagation is...

An $AM$ wave has $1800 \,W$ of total power content. For $100 \%$ modulation, the carrier should have power content equal to: (in $\,W$)

$A$ message signal of frequency $5\,kHz$ is used to modulate a carrier signal of frequency $2\,MHz$. The bandwidth for amplitude modulation is $..........\,kHz$.

In an amplitude modulated wave for an audio frequency of $500 \, \text{cycles/second}$, the appropriate carrier frequency will be ........ $\text{cycles/second}$.