A message signal `m(t)=4cos2000pit` modulates the carrier `C(t)=cos2pif_(c)t` where `f_(c)=1MHz` to produce an `AM` signal. For demodulation using envelope detector the time constant `RC` should satisfy

An audio signal v_m = 20 sin 2 pi (1500 t) amplitude modulates a carrier v_C = 80 sin 2pi (100,000t ) . The value of percent modulation is ___

In amplitude modulation, the message signal V_(m)(t)=10sin(2pixx10^(5)t) volts and Carrier signal V_(C )(t)=20sin(2pixx10^(7)t) volts The modulated signal now contains the message signal with lower side band and upper side band frequency, therefore the bandwidth of modulated signal is alpha KHz. The value of alpha is

Suppose that the modulating signal is m(t)=2cos(2pif_(m)t) and the carrier signal is x_(c)(t)=A_(c)cos(2pif_(c)t) which one of the following is a conventional AM signal without over modulation

If a message signal of frequency ' f_(m) ' is amplitude modulated with a carrier signal of frequency ' f_(c) ' and radiated through an antenna, the wavelength of the corresponding signal in air is :

A message signal of freuency omega_(m) is superposed on a carrier wave of frequency omega_(c) to get an amplititude modulated wave (AM). The frequency of the AM wave will be

A message signal frequency omega_(m) is superpiosed on a carrier wave of frequency omega_(c) to gent an amplitude modulated wave ( AM ).The frequency of the AM wave will be

A message signal of freuency omega_(m) is superposed on a carrier wave of frequency omega_(c) to get an amplititude modulated wave (AM). The frequency of the AM wave will be