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JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank Self Evaluation Test - Communication System

  • question_answer
    A radio station has two channels. One is AM at \[1020\text{ }kHz\] and the other FM at\[89.5\text{ }MHz\]. For good results you will use

    A) longer antenna for the AM channel and shorter for the FM

    B) shorter antenna for the AM channel and longer for the FM

    C) same length antenna will work for both

    D) information given is not enough to say which one to use for which

    Correct Answer: B

    Solution :

    [b] The frequency of AM channel is\[1020\text{ }kHz\]       whereas for the FM it is \[89.5\text{ }MHz\] (given).      For higher frequencies (MHz), space wave      communication is needed. Very tall towers are used as antennas.


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