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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Communication Systems
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What is the modulating factor given maximum peak to peak voltage of an AM is 10mv and minimum peak to peak voltage is 2mv.

$\begin{array}{1 1}(a)\;0.3\\(b)\;3\\(c)\;0.6\\(d)\;6\end{array}$

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Maximum voltage of AM wave $V_{max}=\large\frac{10}{2}$$=5mv$
Minimum voltage of AM wave $V_{min}=\large\frac{2}{2}$$=1mv$
Modulating factor =$\large\frac{V_{max}-V_{min}}{V_{max}+V_{min}}$
$\Rightarrow \large\frac{5-1}{5+1}$
$\Rightarrow \large\frac{4}{6}$
$\Rightarrow 0.6$
Hence (c) is the correct option.
answered Mar 17, 2014 by sreemathi.v

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