{"product_id":"lascells-plancks-constant","title":"Lascells Plancks Constant","description":"\u003cp\u003eModern LEDs (light emitting diodes) cover the range from deep blue to infra-red. By monitoring the voltage at which each LED just begins to emit light a graph of energy input as a function of light emitted frequency can be plotted and an approximate value of Planck’s constant deduced.\u003c\/p\u003e\u003cp\u003eThe system is an excellent illustration of modern electronics and gives a good investigation into a difficult topic in Post-16 physics.\u003c\/p\u003e\u003cp\u003eThe LEDs are mounted in a self-contained box with voltage control and monitoring points for current and voltage. A protection resistor is included to prevent damage to the LEDs.\u003c\/p\u003e\u003cp\u003eComplete with viewing tube but without power supply which should be approximately 5V d.c. from any laboratory source.\u003c\/p\u003e","brand":"EDULAB","offers":[{"title":"Default Title","offer_id":42700501090365,"sku":"107K00679","price":979.44,"currency_code":"AED","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0637\/2583\/0205\/files\/VTN12302496-1.jpg?v=1762706583","url":"https:\/\/eduplaninternational.com\/en-us\/products\/lascells-plancks-constant","provider":"Eduplan International","version":"1.0","type":"link"}