Which of the following is the disadvantage of $FM$ over $AM$?

$A$ diode detector is used to detect an amplitude modulated wave with $60\%$ modulation,using a capacitor of $250 \ pF$ in parallel with a resistor of $100 \ k\Omega$. What is the maximum modulation frequency that can be detected by this circuit?

$A$ signal of $20 kHz$ is being carried on a carrier wave of $3 MHz$. What are the side-band frequencies?

An antenna behaves as a resonant circuit only when its length is

Modulation is a process of superposing

The advantages of optical fiber communication over a two-wire transmission line or coaxial cable are . . . . . . .