{"product_id":"fraunhofers-lines-plate-021-physics-poster","title":"Fraunhofer's Lines – Plate 021 Physics Poster","description":"\u003cp\u003ePlate 21 speaks for itself: \u003cem\u003e“The Sun's fingerprints, read in the dark gaps.”\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eFraunhofer mapped hundreds of dark lines in the solar spectrum. Each is light absorbed by atoms in the Sun's cooler outer layers at a photon energy matching one of their transitions, so the gaps identify the elements.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eE = h c \/ λ\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eE: photon energy, J\u003c\/li\u003e\n\u003cli\u003eh: Planck constant, 6.62607015×10⁻³⁴ J s (exact)\u003c\/li\u003e\n\u003cli\u003ec: speed of light, m s⁻¹\u003c\/li\u003e\n\u003cli\u003eλ: wavelength, m\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eMunich, 1814–15: 574 lines.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eHonest caveat:\u003c\/em\u003e Fraunhofer catalogued the lines; their atomic origin was explained by Kirchhoff and Bunsen in 1859–60.\u003c\/p\u003e\u003ch3\u003eSources\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJ. Fraunhofer, Denkschr. Akad. Wiss. München 5, 193 (1817).\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eOn the poster\u003c\/h3\u003e\u003cp\u003ePlate 021, “Fraunhofer's Lines”: the pixel-art plate with its slogan “The Sun's fingerprints, read in the dark gaps.”, the key equation and the facts panel shown above. Pixelated Physics. Physics. Personified.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"9'' x 12\" (Vertical) \/ Matte","offer_id":50961804918887,"sku":"96353703468122423967","price":19.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Fine Art","offer_id":50961804951655,"sku":"12398488950650021417","price":29.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Semi Glossy","offer_id":50961804984423,"sku":"18594606696374011351","price":19.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Fine Art","offer_id":50961805017191,"sku":"21024784696844101193","price":44.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Semi Glossy","offer_id":50961805049959,"sku":"44071670992135687616","price":29.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Matte","offer_id":50961805082727,"sku":"18569168155978691152","price":29.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Matte","offer_id":50961805115495,"sku":"27059853927184504983","price":69.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Fine Art","offer_id":50961805148263,"sku":"31267369419949252804","price":119.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Semi Glossy","offer_id":50961805181031,"sku":"30994615157886523027","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/11838830291013200145_2048.jpg?v=1793633302","url":"https:\/\/pixelatedphysics.com\/fr\/products\/fraunhofers-lines-plate-021-physics-poster","provider":"Pixelated Physics","version":"1.0","type":"link"}