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JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank Communication

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

    Correct Answer: A

    Solution :

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


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