question_answer 22)

  In amplitude modulation, the modulation index m, is kept less than or equal to 1 because (a) , will result in interference between carrier frequency and message frequency, resulting into distortion (b)  will result in overlapping of both side bands resulting into loss of information (c)  will result in change in phase between carrier signal and message signal (d)  indicates amplitude of message signal greater than amplitude of carrier signal resulting into distortion

Answer:

  (b,d)  The modulation index (m) of amplitude modulated wave is If m > 1, then Am > A c In this situation, there  will be distortion of the resulting signal of amplitude modulated wave. Maximum modulation frequency (m/f) of AM wave is                           If mf >1, then   It means, there will be overlapping of both side bands of modulated wave resulting into loss of information.