Modern Physics 7 Question 31

32. A signal of 5kHz frequency is amplitude modulated on a carrier wave of frequency 2MHz. The frequencies of the resultant signal is/are

(2015 Main)

(a) 2MHz only

(b) 2005kHz2000kHz and 1995kHz

(c) 2005kHz and 1995kHz

(d) 2000kHz and 1995kHz

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Solution:

  1. fc=2MHz=2000kHz,fm=5kHz

Resultant frequencies are,

fc+fm,fc and fcfm or, 2005kHz,2000kHz and 1995kHz



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