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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Communication Systems
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An FM signal has a frequency of 105MHz and highest frequency acquired is 105.05MHz when modulated by a signal.The carrier swing is

$\begin{array}{1 1}(a)\;15\;KHz\\(b)\;50\;KHz\\(c)\;60\;KHz\\(d)\;100\;KHz\end{array}$

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Frequency of carrier wave $f_c=105MHz$
$\Rightarrow 105\times 10^6Hz$
$f_1$=frequency of side band
$\Rightarrow 105.05\times 10^6Hz$
Frequency of signal $=f_1-f_c=(105.05-105)\times 10^6$
$\Rightarrow 0.05\times 10^6$Hz
$\Rightarrow 50\times 10^3$Hz
$\Rightarrow 50$KHz
Hence (b) is the correct answer.
answered Mar 17, 2014 by sreemathi.v

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