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Electromagnetic wave question???

Discussion in 'Electronic Basics' started by tiger, Aug 16, 2008.

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  1. tiger

    tiger Guest

    I've thought about it for a long time, but i still don't know about
    this.
    So please help me,

    Wire is used to transmit electric signal.
    And Light and RF is transmitted through Vacuum or air.

    ------------------------------------------------------------------------
    (1)ULF ~3Hz
    (2)ELF 3Hz~3kHz
    (3)VLF 3kHz¡­30kHz
    (4)LF 30kHz¡­300kHz
    (5)MF 300kHz¡­3MHz
    (6)HF 3MHz¡­30MHz
    (7)VHF 30MHz¡­300MHz
    ------------------------------------------------------------------------
    Micro Wave
    (8)UHF 300MHz¡­3GHz
    (9)SHF 3GHz¡­30GHz
    (10)EHF 30GHz¡­300GHz
    ------------------------------------------------------------------------
    Infrared
    (11)submillimeter 300GHz¡­1THz
    (12)Infrared 100THz
    ------------------------------------------------------------------------
    As far as i know, we can generate GHz pulse into wire, but can't
    generate infrared light into wire. But there is really Ghz wireless
    wave which we are using it with cellphone.

    My question is that what is minimum and maximum frequency that we can
    generate into wire???
     
  2. neon

    neon

    1,325
    0
    Oct 21, 2006
    AS FREQUENCY increases so does the skin effect. meaning at some point there is no current flow into the wire.
     
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