{"product_id":"chadwicks-neutron-plate-047-physics-poster","title":"Chadwick's Neutron – Plate 047 Physics Poster","description":"\u003cp\u003ePlate 47 speaks for itself: \u003cem\u003e“Seen by what it knocks.”\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eAlpha particles on beryllium gave a penetrating neutral radiation that knocked fast protons out of paraffin. Chadwick showed the protons were too fast for gamma rays and that a neutral particle of about the proton's mass fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e⁹Be + ⁴He → ¹²C + n\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e⁹Be: beryllium-9 nucleus\u003c\/li\u003e\n\u003cli\u003e⁴He: alpha particle\u003c\/li\u003e\n\u003cli\u003e¹²C: carbon-12 nucleus\u003c\/li\u003e\n\u003cli\u003en: neutron, mass ≈ 1.675×10⁻²⁷ kg\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNeutral; about the mass of a proton. Paraffin protons: too fast for gammas.\u003c\/p\u003e\u003ch3\u003eSources\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJ. Chadwick, Nature 129, 312 (1932); Proc. R. Soc. A 136, 692 (1932).\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eOn the poster\u003c\/h3\u003e\u003cp\u003ePlate 047, “Chadwick's Neutron”: the pixel-art plate with its slogan “Seen by what it knocks.”, 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":50962186010727,"sku":"14117567647583501335","price":19.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Fine Art","offer_id":50962186043495,"sku":"33289674103446967596","price":29.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Semi Glossy","offer_id":50962186076263,"sku":"29965070816236097861","price":19.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Fine Art","offer_id":50962186109031,"sku":"31026770357676327157","price":44.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Semi Glossy","offer_id":50962186141799,"sku":"94369620168091243362","price":29.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Matte","offer_id":50962186174567,"sku":"65557770762060659127","price":29.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Matte","offer_id":50962186207335,"sku":"33173189303196987976","price":69.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Fine Art","offer_id":50962186240103,"sku":"14010654943520303939","price":119.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Semi Glossy","offer_id":50962186272871,"sku":"17188877510272207329","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/2096427193956085241_2048.jpg?v=1793634659","url":"https:\/\/pixelatedphysics.com\/es\/products\/chadwicks-neutron-plate-047-physics-poster","provider":"Pixelated Physics","version":"1.0","type":"link"}