A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due to (a) poor selection of modulation index (selected 0 < m < 1) (b) poor bandwidth selection of amplifiers (c) poor selection of carrier frequency (d) loss of energy in transmission
Correct option is B) The frequency of male voice is less than that of a female voice. In the given problem, the frequency of modulated signal received becomes more, which is possible with the poor band width selection of amplifiers. It is so because band width in amplitude modulation is equal to twice the frequency of modulating signal.
