CBSE Class 12 Physics 2018 Delhi Set 1 Paper

Question : 10 of 26

Marks: +1, -0

A carrier wave of peak voltage

15 {\V}

is used to transmit a message signal. Find the peak voltage of the modulating signal in order to have a modulation index of

60 \%

Solution:

Formula for modulation index
Finding the peak value of the modulating signal
We have,

µ=\;{A_m}/{A_c}

Here,

µ=60 \%=\;{3}/{5}

∴ A_m=µ A_c=\;{3}/{5} × 15 {\V}=9 {\V}

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