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A message signal of frequency 100MHz and peak voltage 100v is used to execute amplitude modulation on a carrier wave of frequency 300 GHz and peak voltage 400 v. The modulation index and difference between the two side band frequencies are :

(a)

4 ; 2 × 108Hz

(b)

4 ; 1 × 108Hz

(c)

0.25 ; 1 × 108Hz

(d)

0.25 ; 2 × 108Hz



Question ID - 51334 | SaraNextGen Top Answer

A message signal of frequency 100MHz and peak voltage 100v is used to execute amplitude modulation on a carrier wave of frequency 300 GHz and peak voltage 400 v. The modulation index and difference between the two side band frequencies are :

(a)

4 ; 2 × 108Hz

(b)

4 ; 1 × 108Hz

(c)

0.25 ; 1 × 108Hz

(d)

0.25 ; 2 × 108Hz

1 Answer
127 votes
Answer Key / Explanation : (d) -

  Range of frequency = (fc − fm) to (fc + fm)

 Band width =  = 2 × 100 ×106 Hz

                                          = 2 × 108Hz

And modulation index =  =

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