{"product_id":"kundts-tube-plate-086-physics-poster","title":"Kundt's Tube – Plate 086 Physics Poster","description":"\u003cp\u003ePlate 86 speaks for itself: \u003cem\u003e“Sound sweeps dust into rulers.”\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eA standing sound wave in a tube sweeps fine powder into heaps at its nodes. The heaps are half a wavelength apart, so measuring them with a known frequency gives the speed of sound.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ev = 2 f d\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ev: speed of sound, m s⁻¹\u003c\/li\u003e\n\u003cli\u003ef: frequency, Hz\u003c\/li\u003e\n\u003cli\u003ed: spacing between heaps (λ\/2), m\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe heaps are λ\/2 apart, so v = 2fd. Air at 20 °C: v ≈ 343 m\/s.\u003c\/p\u003e\u003ch3\u003eSources\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eA. Kundt, Ann. Phys. 203, 497 (1866).\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eOn the poster\u003c\/h3\u003e\u003cp\u003ePlate 086, “Kundt's Tube”: the pixel-art plate with its slogan “Sound sweeps dust into rulers.”, 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":50962694570087,"sku":"13364263956340314538","price":19.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Fine Art","offer_id":50962694602855,"sku":"26417132388317419101","price":29.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Semi Glossy","offer_id":50962694635623,"sku":"19197515908373796093","price":19.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Fine Art","offer_id":50962694668391,"sku":"17309675641732280879","price":44.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Semi Glossy","offer_id":50962694701159,"sku":"23448778903259524934","price":29.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Matte","offer_id":50962694733927,"sku":"25944981104070942505","price":29.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Matte","offer_id":50962694766695,"sku":"14784419418258907869","price":69.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Fine Art","offer_id":50962694799463,"sku":"27053817995709720436","price":119.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Semi Glossy","offer_id":50962694832231,"sku":"10767449810736409492","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/6040115754816435580_2048.jpg?v=1793637029","url":"https:\/\/pixelatedphysics.com\/ja\/products\/kundts-tube-plate-086-physics-poster","provider":"Pixelated Physics","version":"1.0","type":"link"}