{"product_id":"plancks-constant-led-experiment-kit","title":"Planck's Constant LED Experiment Kit","description":"\u003cp\u003eMeasure Planck's constant at home. Five LEDs at different wavelengths — UV, violet, blue, green, red. Apply voltage until each LED just begins to emit light; that threshold voltage times the electron charge equals the photon energy. Plot energy vs frequency; the slope is h. You are measuring a fundamental constant of nature.\u003c\/p\u003e","brand":"Golden Physics Project","offers":[{"title":"Default Title","offer_id":54140450373924,"sku":"GPP-PLANCK-LED-KIT","price":79.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/2879\/9524\/files\/P2-7135Plank_sconstantApparatus-022048x2048.jpg?v=1780680468","url":"https:\/\/shop.goldenphysics.org\/products\/plancks-constant-led-experiment-kit","provider":"Golden Physics Project","version":"1.0","type":"link"}