What molecular arrangment leads to transperency?
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From: HVAC on 24 Jul 2010 08:40 "bert" <herbertglazier79(a)msn.com> wrote in message news:186e6063-8c86-4587-bcc1-3d7fefb9cb17(a)s9g2000yqd.googlegroups.com... Have green sunglasses and only green light goes through.etc TreBert No
From: bert on 24 Jul 2010 08:40 On Jul 24, 12:29 am, Sam Wormley <sworml...(a)gmail.com> wrote: > On 7/23/10 11:13 PM, Immortalist wrote: > > > Early in his research career, Dr. Ott fell and broke his glasses; > > soon, his arthritis disappeared. And in 1996, Marion Patricia > > Connolly, executive director of Price-Pottenger Nutrition Foundation > > (PPNF), had much the same experience. Full-spectrum eyeglasses, i.e., > > lenses that transmit all ultraviolet light, are difficult to find. I > > take off my glasses outdoors whenever I can. > > A Field Guide to Critical Thinking > http://www.csicop.org/si/show/field_guide_to_critical_thinking/ > http://www.csicop.org/si/9012/critical-thinking.html > > About the Author > James Lett is a Professor of Anthropology, Department of > Social Sciences, Indian River Community College, 3209 > Virginia Avenue, Ft. Pierce, FL 34981. He is author of The > Human Enterprise: A Critical Introduction to > Anthropologcal Theory and Science, Reason, and > Anthropology: The Principles of Rational Inquiry (1997, > Rowman and Littlefield Publishers). He can be reached by > e-mail at the following address: jl...(a)ircc.cc..fl.us Sam Glass has a glare and this lady from upstate NY knew how to get rid of this glare. Kind of interesting it get rid of glare and still lets 99% of the photons through TreBert PS her name was Blodgett and very famous. Got her Dr degree from U of Chicago in just one year. Only had one job it was at GE lab. She was a great inventer. To bad she was before my time.
From: Androcles on 24 Jul 2010 09:32 "Unified_Perspective" <agallist(a)gmail.com> wrote in message news:6ae7ec8a-4c28-4b03-8a0b-1dbd1e62c2f2(a)5g2000yqz.googlegroups.com... On Jul 20, 12:08 pm, Sanny <softtank...(a)hotmail.com> wrote: > We see glass is transparent. > > When light touches a surface it gets absorbed and reflected. > > But in case of glass the light goes inside it and comes out from other > end. > > Earlier I made a guess the number of molecules in glass blocking the > light will be less. > > But then I found some 1 feet thick glass are transparent. > > While even a 1mm thick aluminium plate do not allow to pass the light. > > So number of molecules stopping light do not effect whether a > substance is transparent or not. > > I think its the arrangment of molecules that descide wether the > substance is transparent or not. > > Does Glass molecule acts like a spring? and Just like a Spring allows > waves to travel through it. Glass allows light wave to pass. > > What type of arrangment of molecules lead to transparency? > > Bye > Sanny > > Chat with Physics Professor:http://www.getclub.com/chat_with/?key=Physics There seems to be a general lack illumination on the subject of transparency here. Light which is absorbed by an atom is not generally re-emitted. The exception to this general rule are molecules known as photo-phosphers. They are named for their ability to re-emit (at reduced wave-length). ============================================== Light is energy and energy is conserved. If the atom did not re-emit that energy it would cease to be an atom and become an ion. As a general rule energy is re-emitted, but at lower energy levels. http://en.wikipedia.org/wiki/Hope_Diamond "The stone exhibits an unusually intense and strongly-colored type of luminescence: after exposure to short-wave ultraviolet light, the diamond produces a brilliant red phosphorescence ('glow-in-the-dark' effect) that persists for some time after the light source has been switched off. " ============================================== Materials that absorb light are opaque. ============================================== Materials that absorb energy get hotter until they glow, emitting microwave, infrared, red, orange, yellow, white, blue, violet and x-rays as direct function of their temperature. Materials that do not, generally speaking good insulation type materials, transmit light if their molecular pathways permit. Carbon either absorbs 100# or transmits 90+ percent depending on how its cubic lattice is arranged. Stacked upon each other so the "holes" align as in diamond = transmit. Stacked so the holes are all filled as in plain carbon = absorb. =============================================== The problem with that theory is water isn't crystalline. =============================================== Gases have lots of large holes, so they are typically transparent although those that are good conductors like ozone or hydrogen sulfide can be good absorbers at certain wavelengths. So, there you have it - it all depends - in this case on how things stack up. =============================================== <snip off-topic political can of worms>
From: Brad Guth on 24 Jul 2010 14:14 On Jul 24, 5:29 am, bert <herbertglazie...(a)msn.com> wrote: > On Jul 23, 10:18 pm, Immortalist <reanimater_2...(a)yahoo.com> wrote: > > > > > On Jul 23, 6:24 pm, Sam Wormley <sworml...(a)gmail.com> wrote: > > > > On 7/23/10 7:12 PM, Immortalist wrote: > > > > > So the light (electromagnetic radiation) that hits the glass is > > > > absorbed by electrons and retransmitted to the next mineral (glass > > > > molecule) and so on, till the light has propagated all the way through > > > > the glass? In this way the light is emitted from the other side of the > > > > glass, a sort of replacement light pattern. Some say that this is why > > > > looking through glasses eventually will harm your eyes because some > > > > frequencies don't make it through even they are not visible light. > > > >   Photon Energy > > >    E = hν > > > >    E_emitted ⤠E_absorbed > > > >    No increase in photon energy, therefore wearing glassed does NOT > > >    damage eyes due to increased energy. > > > I have heard that eye glasses filter out some uv and other frequencies > > which subtracts from full spectrum light. Are you sure that glass > > doesn't change the light?- Hide quoted text - > > > - Show quoted text - > > Have green sunglasses and only green light goes through.etc  TreBert Narrow bandpass optics are rather nifty to look through. Try out a violet +/- 10 nm filter for day, and otherwise a deep red +/- 10 nm filter for nighttime, or vise versa. Better yet, use them combined as stacked narrow bandpass filters. ~ BG
From: Brad Guth on 24 Jul 2010 14:18
On Jul 24, 6:32 am, "Androcles" <Headmas...(a)Hogwarts.physics_z> wrote: > "Unified_Perspective" <agall...(a)gmail.com> wrote in message > > news:6ae7ec8a-4c28-4b03-8a0b-1dbd1e62c2f2(a)5g2000yqz.googlegroups.com... > On Jul 20, 12:08 pm, Sanny <softtank...(a)hotmail.com> wrote: > > > > > We see glass is transparent. > > > When light touches a surface it gets absorbed and reflected. > > > But in case of glass the light goes inside it and comes out from other > > end. > > > Earlier I made a guess the number of molecules in glass blocking the > > light will be less. > > > But then I found some 1 feet thick glass are transparent. > > > While even a 1mm thick aluminium plate do not allow to pass the light. > > > So number of molecules stopping light do not effect whether a > > substance is transparent or not. > > > I think its the arrangment of molecules that descide wether the > > substance is transparent or not. > > > Does Glass molecule acts like a spring? and Just like a Spring allows > > waves to travel through it. Glass allows light wave to pass. > > > What type of arrangment of molecules lead to transparency? > > > Bye > > Sanny > > > Chat with Physics Professor:http://www.getclub.com/chat_with/?key=Physics > > There seems to be a general lack illumination on the subject of > transparency here. > > Light which is absorbed by an atom is not generally re-emitted. The > exception to this general rule are molecules known as photo-phosphers. > They are named for their ability to re-emit (at reduced wave-length). > > ============================================== > Light is energy and energy is conserved. If the atom did not re-emit > that energy it would cease to be an atom and become an ion. > As a general rule energy is re-emitted, but at lower energy levels. > http://en.wikipedia.org/wiki/Hope_Diamond > "The stone exhibits an unusually intense and strongly-colored type of > luminescence: after exposure to short-wave ultraviolet light, the diamond > produces a brilliant red phosphorescence ('glow-in-the-dark' effect) that > persists for some time after the light source has been switched off. " > ============================================== > > Materials that absorb light are opaque. > ============================================== > Materials that absorb energy get hotter until they glow, emitting > microwave, infrared, red, orange, yellow, white, blue, violet and > x-rays as direct function of their temperature. > > Materials that do not, generally speaking good insulation type > materials, transmit light if their molecular pathways permit. Carbon > either absorbs 100# or transmits 90+ percent depending on how its > cubic lattice is arranged. Stacked upon each other so the "holes" > align as in diamond = transmit. Stacked so the holes are all filled as > in plain carbon = absorb. > =============================================== > The problem with that theory is water isn't crystalline. > =============================================== > > Gases have lots of large holes, so they are > typically transparent although those that are good conductors like > ozone or hydrogen sulfide can be good absorbers at certain > wavelengths. > > So, there you have it - it all depends - in this case on how things > stack up. > =============================================== > <snip off-topic political can of worms> With sufficient atom density, even the transparency of a gas can nearly stop photons dead in their tracks. ~ BG |