| Topic: |
Science > Physics |
| User: |
"" |
| Date: |
13 Oct 2006 11:23:06 AM |
| Object: |
Reflecting Light |
Hello everybody,
Is it possible for monochromatic blue light to strike an object and
be reflected as monochromatic red light?
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| User: "Sorcerer" |
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| Title: Re: Reflecting Light |
13 Oct 2006 01:40:37 PM |
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<actionintegral@yahoo.com> wrote in message
news:1160756586.213874.269230@e3g2000cwe.googlegroups.com...
| Hello everybody,
|
| Is it possible for monochromatic blue light to strike an object and
| be reflected as monochromatic red light?
|
Yes, where there is relative motion between observer and reflecting
object, separating. Doppler shift is well known.
Androcles
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| User: "tadchem" |
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| Title: Re: Reflecting Light |
15 Oct 2006 08:56:00 AM |
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wrote:
Hello everybody,
Is it possible for monochromatic blue light to strike an object and
be reflected as monochromatic red light?
If there is a frequency change, then true reflection is not occurring.
Frequency halving is a much more complex process involving non-linear
properties of transmitting media:
http://www.google.com/search?num=100&hl=en&lr=&q=%22frequency+halving%22+light&btnG=Search
Tom Davidson
Richmond, VA
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| User: "Sorcerer" |
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| Title: Re: Reflecting Light |
15 Oct 2006 11:26:34 AM |
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"tadchem" <tadchem@comcast.net> wrote in message
news:1160920560.737890.38110@f16g2000cwb.googlegroups.com...
|
| wrote:
| > Hello everybody,
| >
| > Is it possible for monochromatic blue light to strike an object and
| > be reflected as monochromatic red light?
|
| If there is a frequency change, then true reflection is not occurring.
There is a frequency change if the reflecting object is
receding, although blue to red would be enormous. In reality it
would be a velocity of light change, (c-v) = lambda.nu.
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| User: "" |
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| Title: Re: Reflecting Light |
15 Oct 2006 06:12:33 AM |
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wrote:
Hello everybody,
Is it possible for monochromatic blue light to strike an object and
be reflected as monochromatic red light?
What if the mechanism for reflection was compton scattering?
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| User: "Richard Tobin" |
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| Title: Re: Reflecting Light |
13 Oct 2006 11:30:38 AM |
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In article <1160756586.213874.269230@e3g2000cwe.googlegroups.com>,
<actionintegral@yahoo.com> wrote:
Is it possible for monochromatic blue light to strike an object and
be reflected as monochromatic red light?
Yes, if the object is moving away from the light source fast enough.
-- Richard
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| User: "" |
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| Title: Re: Reflecting Light |
13 Oct 2006 11:39:53 AM |
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Richard Tobin wrote:
Yes, if the object is moving away from the light source fast enough.
-- Richard
That is a very clever answer that I hadn't thought of. But as far as
the object is concerned, the light is not blue, correct?
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| User: "" |
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| Title: Re: Reflecting Light |
13 Oct 2006 12:04:22 PM |
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wrote:
Richard Tobin wrote:
Yes, if the object is moving away from the light source fast enough.
-- Richard
That is a very clever answer that I hadn't thought of. But as far as
the object is concerned, the light is not blue, correct?
Fluoresence or phosphoresence would be options.
John
Aspen Research, - www.aspenresearch.com
"Turning Questions into Answers"
Opinions expressed herein are my own and may not represent those of my
employer.
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| User: "Randy Poe" |
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| Title: Re: Reflecting Light |
13 Oct 2006 12:31:01 PM |
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wrote:
Richard Tobin wrote:
Yes, if the object is moving away from the light source fast enough.
-- Richard
That is a very clever answer that I hadn't thought of. But as far as
the object is concerned, the light is not blue, correct?
No, the incident and reflected light are both green.
Something akin to fluorescence (given lower down in
the thread) is the real answer, where an electron is
bumped up in one step by the blue photon, but then falls
back down in two smaller steps, emitting red light.
- Randy
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| User: "Richard Tobin" |
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| Title: Re: Reflecting Light |
13 Oct 2006 06:12:18 PM |
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In article <1160760661.477695.157300@m73g2000cwd.googlegroups.com>,
Randy Poe <poespam-trap@yahoo.com> wrote:
Something akin to fluorescence (given lower down in
the thread) is the real answer, where an electron is
bumped up in one step by the blue photon, but then falls
back down in two smaller steps, emitting red light.
Is it possible for the two steps to be of exactly equal size, which
would be required for the reflected light to be monochromatic as
requested?
-- Richard
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