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By:Eisco

Eisco Labs Planck's Constant Determination Box

Item #: 2023140
$168.99 $126.74
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This Eisco Labs apparatus is designed to determine the approximate value of Planck's constant using the elbow voltage in the characteristic curves of a number of LEDs. There are 7 LEDs, covering from deep blue at 470 nm to near IR 940 nm, mounted on the box with sockets for voltage and current measurements. By monitoring the voltage at which each LED 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 can be deduced. Plastic viewing tube included. Box measures 8 W x 4-3/4 L x 1 H inches. Requires: Power Supply (9V DC), Voltmeter (0-9 Volts), Ammeter (20mA) and 6 Banana Plug Connecting Leads (NOT INCLUDED).