7A10.33 - Planck's Constant - LED's
The LED's are designed to be powered off of 6 volts. Use the multimeter to check the voltage if you wish. Hook the oscilloscope across the current resistor and the other lead across the diode. With an xy display a sharp "knee" in the curve is clearly seen. A plot of the "knee" voltage for the 6 different wave lengths of the array should give you measurements for Planck's Constant.
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