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Solid State Electronic Device

Discussion in 'Electronics Homework Help' started by vick5821, Jun 5, 2012.

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  1. vick5821

    vick5821

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    Jan 22, 2012
    If energy gap, Eg of GaAs is 1.43eV, calculate the wavelength of the compound and comment on the spectrum that will be observed.

    I have calculated the wavelength. But How do I know whether it can be observed in which spectrum ?

    Thank you
     
  2. CocaCola

    CocaCola

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    Apr 7, 2012
  3. vick5821

    vick5821

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    Jan 22, 2012
    So 0.87micro meter should be which?
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    It would be very close to 870 nm. And you can google for what colour that is.
     
  5. vick5821

    vick5821

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    colour ? LOL..thought spectrum ?
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Isn't light part of the electromagnetic spectrum?
     
  7. vick5821

    vick5821

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    Jan 22, 2012
    Yea..but is 870nm in infrared spectrum ?
     
  8. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Well there you are. That's what spectrum it's in!
     
  9. vick5821

    vick5821

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    Jan 22, 2012
    That is the answer given by my lecturer.But I dun get how to determine it from the spectrum ? 870nm is higher than 100nm.So it suppose to be very near to visible light region is it ?
     
  10. CocaCola

    CocaCola

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    Apr 7, 2012
    Did you look at a chart, the one I posted? Human visible light is in the 390-750nm range give or take...

    870nm is infrared just outside human visible range
    100nm is ultraviolet, well outside human visible range

    [​IMG]
     
  11. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    IR is right next door to visible light.

    Indeed, you'll often find it listed in the visible spectrum even though it's not visible.

    The names given to parts of the electronic spectrum are man-made and really exist as a rough shorthand. Often (well, almost always) there is little to distinguish wavelengths that are just inside or just outside the defined region.

    Most of the shorter spectra is grouped by wavelength. For lower frequency spectra wavelength tends to give way to frequency.

    Knowing what each part of the spectrum is named is purely a memory exercise (except maybe the visible spectrum!)
     
  12. vick5821

    vick5821

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    Jan 22, 2012
    So what I meant is 870nm is very closed to the visible light region. Correct ? Haahaha.

    Thanks man
     
  13. davenn

    davenn Moderator

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    Sep 5, 2009
    close but still well out of the visible range

    Dave
     
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