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  1. Where do colours come from?Grzegorz KarwaszAndrzej KarbowskiAnia Kamińska*Krzysztof SłużewskiDidactics of Physics Division, Institute of PhysicsFaculty of Physics, Astronomy and Applied Informatics, Nicolaus Copernicus University in Toruń* Pomeranian Pedagogical University, Słupsk, Poland dydaktyka.fizyka.umk.pl

  2. What colour is the pink lamp?

  3. What colour is the blond hair?

  4. What are the colours of a soap ball?

  5. UltraViolet UltraViolet InfraRed InfraRed What are the colours of a rainbow? ? Tęcza na suficie http://dydaktyka.fizyka.umk.pl/Wystawy_archiwum/z_omegi/tecza.html (foto S. Lorenzo in Banale, GK, 19.09.2014)

  6. Where do colours come from? • Physics • Chemistry • Biology • Psychology = Intersdisciplinary pathways [please copy] Visible ligth: 380 nm – 760 nm 1.65 eV – 3.3 eV

  7. What colours is the blond hair?

  8. What colour is the pink lamp? Diffraction gratings:

  9. Two more pink lamps

  10. The same? helium nitrogen (N2)

  11. How do we measure colours? 2 lampy

  12. What are the basic colours? USA filters In print (i.e. subtraction): cyan, magenta, yellow Window in one Berlin shop (2005) In emission (i.e. addition): red, green, blue TV set in one of Paris hotels (2004)

  13. What are the basic colours? Red: ~ 600-700 nm Green: 495-570 nm Magenta: 380 – 500 + > 600 nm teachersource.com (USA)

  14. Physics: diffraction Δl=nλ Energy saving lamp Sunrise Colours from diffraction on a CD

  15. Where do colours come from? Physics Refraction, i.e. different velocity of propagration for different wavelengths: n =1.4 for red, n= 1.45 for violet

  16. Where do colours come from? Physics Morpho Menelaus: male vs female Colours from diffraction on gratings of the wing

  17. Why the sky is blue? Separation of colours by selective diffusion (scattering)

  18. More, complementary sky colours Foto: Carmen Busco, Sao Paolo With kind thanks!

  19. Atmospheric spectroscopy Isola di Rodi, Foto Federico Fedrizzi Rayleigh scattering Berlin, 22.06.2005,photo GK

  20. Where do colours come from? River Separation of colours by selective reflection/ absorption in water (blue is transmitted into water, red is reflected)

  21. Where do colours come from? – Sunglasses Colours from selective reflection Colours from absorption

  22. Swarovski’s piramide (and sphere) Brown, deep blue, yelowish - these are not basic colours: refraction in the piramide + selective reflection from bottom layer .

  23. What colours are soap bubbles? Basic colours in absorption (in print): magenta, cyan, yellow= double colours in emission: magenta=blue + red, etc. .

  24. Colours of soap bubbles Constructive interference of reflected ligth: . http://www.amazingbubbleman.com/shared-links/

  25. UltraViolet InfraRed What are the colours of rainbow? n=1,343 n=1,332 Tęcza na suficie Blue comes from a lower angle http://dydaktyka.fizyka.umk.pl/Wystawy_archiwum/z_omegi/tecza.html (foto S. Lorenzo in Banale, GK, 19.09.2014)

  26. UltraViolet InfraRed What are the colours of (a) rainbow? Tęcza na suficie http://dydaktyka.fizyka.umk.pl/Wystawy_archiwum/z_omegi/tecza.html (foto S. Lorenzo in Banale, GK, 19.09.2014)

  27. What are the colours of rainbow? Magenta? http://dydaktyka.fizyka.umk.pl/Wystawy_archiwum/z_omegi/tecza.html (foto S. Lorenzo in Banale, GK, 19.09.2014)

  28. What are the colours of rainbow? Several diffraction series, depending on droplets’ sizes

  29. Where do colours come from? Chemistry The emission spectrum of hydrogen (a) and helium (b) Chemistry, i.e. electrons with energies according to Bohr, Schrödinger and Pauli

  30. Where do colours come from? Chemistry + Physics Atoms in crystaline electrostatic field: a) quartz: SiO2 b) amethyst: Fe+2 in SiO2 c) azurite: CuSO4 Saphire: Fe+2 in Al2O3

  31. Physics: non-isolated atoms Atoms in crystaline electrostatic field – energy levels get shifted: a) Cr+3 (yellow) gets greenish in glass b) Cr+3 in Al2O3 gets red-like (= ruby) G. Karwasz, Rubiny i berlińskie szkło, Chemia w Szkole 3/2012

  32. Where do colours come from? Organic chemistry 330px-Indigofera_tinctoria1 Absorbs yellow-to-red (=orange), so it appears blue (i.e. indigo) Usually extra electrons on double bonds

  33. Organic chemistry: Cochenille red[czerwiec] Absorbsviolet-to-yellow, so it appears carmine-red A. Withney et al, Applied Spectroscopy 61 (2007) 994

  34. Tonic water: absorption and emission bands are shifted http://chemwiki.ucdavis.edu/Core/Analytical_Chemistry/ Analytical_Chemistry_2.0/10_Spectroscopic_Methods/10F%3A_Photoluminescence_Spectroscopy http://www.olympusmicro.com/primer/techniques/confocal/fluoroexciteemit.html

  35. Jabłoński diagram e.g. chlorophyll Fluorescence („immediately”) Phosphorescence (delayed)

  36. Why chlorophyll is green? absorption and emission spectra of chlorophyll

  37. Chlorophyll does not absorb green! chlorophyll solution illuminated lasers:(b) violet, (c) green and (d) red (a) is the chlorophyll solution seen in white ligth and (e) is water in red ligth M. Gagoś, G. Karwasz, Chemia w Szkole (2012)

  38. And what in theew in this bottle? absorption and fluorescence spectra of 7-hydroxycoumarin simplified Jablonskidiagram Probably nothing for kids

  39. Colours of cabbage

  40. Changing pH↔changing equilibrium Pelargonia, kompot z wiśni, zasada Flavonoids, caretonoids, etc. M. Gagoś, G. Karwasz, Colour and chemical Structure, Chemia w Szkole 3/2012

  41. Absorption curves 2 intersections: 3 different forms

  42. The role of the solvent: shifiting levels 4- dimethylamino-4’nitrostilbene

  43. How can we see infrared? Proszę wyjąć komórki Infrared sensors of vipers photo GK i https://it.wikipedia.org/wiki/Crotalus

  44. Why there is no blue flowers (inpollinated by bees)? Baptisia austrialis (false indigo) Centaurea cyanus (cornflower) CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=173802 http://galeria.swiatkwiatow.pl/zdjecie/chaber-blawatek,110360,721.html

  45. Bees see violet, but not blue! Bees’ eye is different from human. Bees eye is best to see solid colors, especially yellow, but seesalso ultraviolet (maximum sensitivity of 344 nm). Bees can see the contrast of green and brown for them is black. G. Karwasz, On the Track of Modern Physics, UMK

  46. Colors, the eye of the bee Cherry flowers in UV

  47. Butterfly impressionst 15 different colour receptors (other butterflies only 4, including UV) http://www.sciencemag.org/news/2016/03/butterfly-has-extreme-color-vision?utm_campaign=email-news-latest&et_rid=35353469&et_cid=327254

  48. Colors, the eye of artists Claude Monet, Ponte d’Argenteuil

  49. Colors, the eye of artists: no automatic white adjustment Cathédrale de Rouen

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