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Question dealing with electrolysis and laser calculation. tia sal2

Discussion in 'Electronic Basics' started by [email protected], May 23, 2006.

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  1. Guest

    Greetings All

    I have a question dealing with electrolysis and lasers the text books
    say you need 1.25 electron-volts (eV) or 2.002 x 10 - 19 Joules to do
    electrolysis with water. A small pen laser puts out about 5mW which is
    about .005 Joules. Why can't small pen lasers do electrolysis? Are my
    calculations incorrect or am I not taking into some other factor.

  2. That sounds to me like the work needed to electrolyze one water
    molecule. Or maybe the work per electron, and two electrons have to flow
    to electrolyze a water molecule, so you may need twice that much to
    electrolyze one water molecule.
    That's .005 joule per second.
    I would say both. For one thing, water molecules don't do much
    absorbing of laser pointer light. And if you use a wavelength that water
    molecules do absorb, you just heat the water.

    - Don Klipstein ()
  3. Jasen Betts

    Jasen Betts Guest

    no it isn't

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