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JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank Mock Test - Electronic Devices Communication Systems

  • question_answer
    Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50 V is amplitude modulated by sinusoidal voltage of frequency 10 kHz producing 50% modulation. The lower and upper side-band frequencies in kHz are

    A) \[1490,\,1510\]  

    B) \[1510,\,1490\]

    C) \[\frac{1}{1490},\frac{1}{1510}\]          

    D) \[\frac{1}{1590},\frac{1}{1490}\]

    Correct Answer: A

    Solution :

    [a] Here, \[{{f}_{c}}=1.5MHz=1500kHz,{{f}_{m}}=10kHz\] \[\therefore \] Low side band frequency \[={{f}_{c}}-{{f}_{m}}=1500kHz-10kHz=1490kHz\]Upper side band frequency \[={{f}_{c}}+{{f}_{m}}=1500kHz+10kHz=1510kHz\]


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