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 :

  • Option 1)

     2 MHz only
     

     

  • Option 2)

     2005 kHz, and 1995 kHz

  • Option 3)

     2005 kHz, 2000 kHz and 1995 kHz

     

  • Option 4)

     2000 kHz and 1995 kHz

 

Answers (1)

As we learnt in

Amplitude Modulation -

The amplitude of modulated wave is varied in accordance with the amplitude of modulating wave.

- wherein

 

 Amplitude modulated wave consists of three freuencies are \omega_{c}+\omega_{m},\; \omega, \; \omega_{c}-\omega_{m}

i.e. 2005 KHz,  2000 KHz,  1995 KHz

Correct option is 3.

 


Option 1)

 2 MHz only
 

 

This is an incorrect option.

Option 2)

 2005 kHz, and 1995 kHz

This is an incorrect option.

Option 3)

 2005 kHz, 2000 kHz and 1995 kHz

 

This is the correct option.

Option 4)

 2000 kHz and 1995 kHz

This is an incorrect option.

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