In amplitude modulation, the message signal is m(t) = 10 sin(2π × 105t) volts and the carrier signal is c(t) = 20 sin(2π × 107t) volts. The bandwidth of the modulated signal is β kHz. The value of β is:

In amplitude modulation, if a message signal of 5 kHz is modulated by a carrier wave of frequency 900 kHz, then the frequencies of the sidebands are:

According to Nyquist's sampling theorem, a continuous band-limited signal with no frequency components higher than fm Hz can be uniquely reconstructed if it is sampled at uniform intervals spaced at most by: