2. Sample Papers
  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-24

  • question_answer
    A radio station has two channels. One is AM at 1020 kHz and the other FM at \[89.5\] 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: A

    Solution :

    For efficient radiation and reception the height to be the transmitting and receiving antennas should be comparable to a quarter wavelength (velocity = wavelength X frequency) of the frequency used. Therefore, FM has shorter antenna and AM has longer antenna.


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