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Figure shows a communication system. What is the output power when input signal is of 1.01 mW? [Gain in dB= 10 log10 (P0 / P1)]

0 1 View | Posted 4 months ago
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    Answered by

    alok kumar singh | Contributor-Level 10

    4 months ago

    This is a  Short Answer Type Questions as classified in NCERT Exemplar

    Total distance = 5km and loss is 2 dB/km

    So total loss = 5 (2)= 10 dB

    Total gain in amplifier  10+20= 30dB and gain in signal is 20dB

    So by the formula 20= 10log10 p o p i

    log10 p o p i = 2

    so po/pi= 102

    so Po= Pi (100)= 101mW

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