Modern Physics 7 Question 88

18. A 100V carrier wave is made to vary between 160V and 40 V by a modulating signal. What is the modulation index?

(a) 0.4

(b) 0.5

(c) 0.6

(d) 0.3

(Main 2019, 12 Jan I)

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Solution:

  1. Modulation index is given by

μ=AmaxAminAmax+Amin=Vmax Vmin Vmax +Vmin =16040160+40=120200=0.6



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