regarding antennas

Discussion in 'General Electronics Chat' started by elisettynarendra, Aug 18, 2010.

  1. elisettynarendra

    Thread Starter Member

    May 17, 2010
    42
    1
    light being an electromagnetic wave i.e, it consists of electric and magnetic fields .....why cant light induce current in conductors just like how a radio wave do ?
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Probably has something to do with wavelength.

    The human eye responds to wavelengths from around 390 to 750 nanometers.

    A half wave dipole (for instance) at those wavelengths would be rather short. A human hair might be 100 micrometers in diameter or 100,000 nanometers.
     
  3. mbohuntr

    Active Member

    Apr 6, 2009
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    For infared light, which the upper limits are near 940nm, your talking about a 470nm antenna (right?). No coffee yet, what is that frequency... ok... 3.19 Terahertz We are approaching that with switching speed now...
     
    Last edited: Aug 18, 2010
  4. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
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    Add to this that by physics light is both a partical and a wave; photons "vibrating" at a specific frequency and that frequency determines the "color" perceived by whatever it hits.

    It is neither electrical nor magnetical, it's one of those oddities in physics where no perfect answer yet exists.
     
  5. Ghar

    Active Member

    Mar 8, 2010
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