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Jasen Betts
science forum Guru Wannabe
Joined: 31 Jul 2005
Posts: 176
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 Posted: Wed May 24, 2006 8:50 am Post subject:
Re: Question dealing with electrolysis and laser calculation. tia sal2
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On 2006-05-23, temp@temp.com <not@not.com> wrote:
| Quote: | 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.
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yes.
| Quote: | A small pen laser puts out about 5mW which is about .005 Joules.
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no it isn't
Bye.
Jasen |
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Don Klipstein
science forum beginner
Joined: 12 Jul 2005
Posts: 16
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| Posted: Tue May 23, 2006 1:38 am Post subject:
Re: Question dealing with electrolysis and laser calculation. tia sal2
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In article <Xns97CBD46ED4B75tenotempcom@140.99.99.130>, temp@temp.com wrote:
| Quote: | 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.
|
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.
| Quote: | A small pen laser puts out about 5mW which is about .005 Joules.
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That's .005 joule per second.
| Quote: | Why can't small pen lasers do electrolysis? Are my
calculations incorrect or am I not taking into some other factor.
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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 (don@misty.com) |
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temp@temp.com
science forum beginner
Joined: 16 Apr 2006
Posts: 4
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| Posted: Tue May 23, 2006 12:52 am Post subject:
Question dealing with electrolysis and laser calculation. tia sal2
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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.
Thanks
sal2 |
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