Modern Physics Ques 279
- A signal of $5$ $ kHz$ frequency is amplitude modulated on a carrier wave of frequency $2$ $ MHz$. The frequencies of the resultant signal is/are
(2015 Main)
(a) $2 $ $MHz$ only
(b) $2005 $ $kHz$ $ 2000 $ $kHz$ and $1995 $ $kHz$
(c) $2005 $ $kHz$ and $1995 $ $kHz$
(d) $2000 $ $kHz$ and $1995 $ $kHz$
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Answer:
Correct Answer: 279.(b)
Solution:
Formula:
- $f _c=2 MHz=2000 $ $kHz, f _m=5 $ $kHz$
Resultant frequencies are,
$f _c+f _m, f _c \text { and } f _c-f _m $
$\text { or, } 2005$ $ kHz, $ $2000 $ $kHz \text { and } 1995$ $ kHz$
BETA
