A signal of $5 k H z$ frequency is amplitude modulated on a carrier wave of frequency $2 M H z$ . Frequencies of the resultant signal is/are

2 M H z

only

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2005 k H z

and

1995 k H z

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2005 k H z

2000 k H z

and

1995 k H z

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2000 k H z

and

1995 k H z

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Solution

The correct option is C $2005 k H z$ , $2000 k H z$ and $1995 k H z$
$f_{c} = 2 M H z = 2000 K H z$
$f_{m} = 5 K H z$
The resultant frequencies are: $f_{c} - f_{m}$ , $f_{c}$ , $f_{c} + f_{m}$
Thus, the frequencies are $1995$ , $2000$ and $2005 K H z$ .

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