| Topic: |
Science > Physics |
| User: |
"Radium" |
| Date: |
02 Dec 2003 10:56:30 AM |
| Object: |
Hot and Green? |
If copper is heated enough to glow, will it give out green light?
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| User: "Steve Turner" |
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| Title: Re: Hot and Green? |
02 Dec 2003 05:10:24 PM |
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(Radium) wrote:
If copper is heated enough to glow, will it give out green light?
Not at the temperatures which ordinarily cause hot objects to glow.
Red-hot copper is just that - red. Looks just like red-hot iron or
red-hot platinum.
Steve Turner
Real address contains worldnet instead of spamnet
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| User: "Gregory L. Hansen" |
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| Title: Re: Hot and Green? |
03 Dec 2003 03:35:37 PM |
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In article <464c821f.0312020856.71ea56b1@posting.google.com>,
Radium <glucegen@excite.com> wrote:
If copper is heated enough to glow, will it give out green light?
Hot copper metal glows red.
--
"The preferred method of entering a building is to use a tank main gun
round, direct fire artillery round, or TOW, Dragon, or Hellfire missile to
clear the first room." -- THE RANGER HANDBOOK U.S. Army, 1992
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| User: "Ken S. Tucker" |
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| Title: Re: Hot and Green? |
04 Dec 2003 11:14:41 AM |
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(Gregory L. Hansen) wrote in message news:<bqlkv9$e10$2@hood.uits.indiana.edu>...
In article <464c821f.0312020856.71ea56b1@posting.google.com>,
Radium <glucegen@excite.com> wrote:
If copper is heated enough to glow, will it give out green light?
Hot copper metal glows red.
As a kid I used Nichrome wire, you know
that curly resistive wire, and progressively
reduced the separation of the 120 volt
connection points to create higher temperature.
It was my *visual impression* that it glowed
briefly with a tinge of lime green before actually
melting at a point (snap crackle pop), ending the
experiment. Anyone else ever see this?
KST
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| User: "jacques jedwab" |
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| Title: Re: Hot and Green? |
03 Dec 2003 03:29:10 AM |
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In article <464c821f.0312020856.71ea56b1@posting.google.com>,
glucegen@excite.com (Radium) wrote:
If copper is heated enough to glow, will it give out green light?
The spark spectrum of Cu (as generated in visible/UV spectrography) is
mainly green. T is about 6000°C. You see it in your neighbourhood if it
has a tramway with aerial line.
J.J.
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| User: "Richard Schultz" |
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| Title: Re: Hot and Green? |
03 Dec 2003 09:46:49 AM |
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In sci.chem jacques jedwab <jjedwab@ulb.ac.be> wrote:
: In article <464c821f.0312020856.71ea56b1@posting.google.com>,
: (Radium) wrote:
:> If copper is heated enough to glow, will it give out green light?
: The spark spectrum of Cu (as generated in visible/UV spectrography) is
: mainly green. T is about 6000?C. You see it in your neighbourhood if it
: has a tramway with aerial line.
When I was in high school, I took a gander at the flame of a bunsen burner
through a cheap spectroscope. There was a prominent green line. I assumed
that it was Cu from brass in the burner itself (the room lights were off,
so if it was an Hg line, it certainly wasn't from the room fluorescents).
-----
Richard Schultz
Department of Chemistry, Bar-Ilan University, Ramat-Gan, Israel
Opinions expressed are mine alone, and not those of Bar-Ilan University
-----
"Life is a blur of Republicans and meat." -- Zippy
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| User: "The Ghost In The Machine" |
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| Title: Re: Hot and Green? |
03 Dec 2003 02:09:41 PM |
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In sci.physics, Radium
<glucegen@excite.com>
wrote
on 2 Dec 2003 08:56:30 -0800
<464c821f.0312020856.71ea56b1@posting.google.com>:
If copper is heated enough to glow, will it give out green light?
http://www.webelements.com/webelements/elements/text/Cu/key.html
goes into some detail as to various copper salts and at what color
they burn.
--
#191,
It's still legal to go .sigless.
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| User: "pete" |
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| Title: Re: Hot and Green? |
02 Dec 2003 08:21:26 PM |
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Radium wrote:
If copper is heated enough to glow, will it give out green light?
By the time it's hot enough to emit green wavelengths,
it's still emitting the red ones too, so it looks yellow.
If you heat it up to white hot, then it emits the whole spectrum.
The color of incandescent glow is determined entirely
by the temperature, and not by the type of material.
--
pete
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| User: "Sam Wormley" |
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| Title: Re: Hot and Green? |
02 Dec 2003 10:57:59 AM |
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Radium wrote:
If copper is heated enough to glow, will it give out green light?
Try it--An experiment is worth a thousand expert opinions!
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| User: "Fred B. McGalliard" |
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| Title: Re: Hot and Green? |
03 Dec 2003 10:23:05 AM |
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You should already know the answer. The green glow will show up when the Cu
is heated to the point that the atoms become ionized. You won't see it in a
solid, where the atoms are merged into a conductive conduction band.
"Sam Wormley" <swormley1@mchsi.com> wrote in message
news:3FCCC493.FBD6AACF@mchsi.com...
Radium wrote:
If copper is heated enough to glow, will it give out green light?
Try it--An experiment is worth a thousand expert opinions!
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| User: "Sam Wormley" |
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| Title: Re: Hot and Green? |
03 Dec 2003 09:19:20 PM |
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"Fred B. McGalliard" wrote:
You should already know the answer. The green glow will show up when the Cu
is heated to the point that the atoms become ionized. You won't see it in a
solid, where the atoms are merged into a conductive conduction band.
That's the point isn't it.... So an experiment should quickly confirm
that solid copper when heated will glow--Wien's law applies.
http://scienceworld.wolfram.com/physics/WienLaw.html
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| User: "*v*" |
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| Title: Re: Hot and Green? |
04 Dec 2003 08:33:22 PM |
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"Sam Wormley" <swormley1@mchsi.com> wrote in message
news:3FCEA7B2.7084039F@mchsi.com...
"Fred B. McGalliard" wrote:
You should already know the answer. The green glow will show up when the Cu
is heated to the point that the atoms become ionized. You won't see it in a
solid, where the atoms are merged into a conductive conduction band.
That's the point isn't it.... So an experiment should quickly confirm
that solid copper when heated will glow--Wien's law applies.
http://scienceworld.wolfram.com/physics/WienLaw.html
You are thinking of specific atomic transitions, but hot materials could glow
green due to general thermodynamics. The principle that emissivity equals
absorptivity (ie, that 70% reflectivity = emitting 30% of black body radiation
intensity, but at correct spectral distribution for temperature) is true for
each separate wavelength division! Hence, if a material was absorbing in the
green but reflected red and blue (would look purple), it would glow green when
heated up enough. That's weird, but correct in principle. However, in practice,
few materials can maintain such properties at the requisite high temperatures. I
would love to see glowing green coals, though.
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| User: "Unfeign" |
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| Title: Re: Hot and Green? |
02 Dec 2003 03:49:15 PM |
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probably blue, actually. in pyrotechnics, copper compounds are used
to create blue color in fireworks. when copper sulfate or copper
carbonate are used in mixtures, or as the oxidant, you get a nice blue
color (depending on your recipie). be sure to avoid having any
sodium in there, though, or having the flame too hot, it will wash out
the blue color.
On 2 Dec 2003 08:56:30 -0800, (Radium) wrote:
If copper is heated enough to glow, will it give out green light?
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| User: "Michael Moroney" |
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| Title: Re: Hot and Green? |
02 Dec 2003 05:10:39 PM |
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Unfeign <cm4tp@virginia.edu> writes:
probably blue, actually. in pyrotechnics, copper compounds are used
to create blue color in fireworks. when copper sulfate or copper
You also need chlorine (or other halogen) to get the blue color
as well as a fairly cool flame. Otherwise you'll get a weak green.
--
-Mike
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